Added Convertigo images documentation. (docker-library#820)

* Created Convertigo docs folder

convertigo/README-short.txt

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+Convertigo is an open source MBaaS/MADP platform for mobile application development and back-end.

convertigo/content.md

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+# What is Convertigo Mobility Platform ?
+
+Convertigo Community edition is an open source MBaaS (Mobile Back end as a Service) combined with a MADP (Mobile application development platform). The platform is used to build complex Cross-platform Enterprise Mobile apps in a few days. Convertigo platform is composed of several components:
+
+1.	**Convertigo**: The back-end MBaaS server part. Runs as a Docker container with **convertigo** image
+2.	**Convertigo Web Connector**: An optional HTML web Connector server able to connect to any HTML based legacy app. Runs as a Docker container with a **web-connector** tag
+3.	**Convertigo Studio**: Runs on a Windows or a MacOS workstation, Eclipse based IDE, used to program MBaaS workflows and to build Mobile apps UIs. Can be directly downloaded from [Sourceforge.net](https://sourceforge.net/projects/convertigo/files/latest/download)
+4.	**Convertigo SDKs**: Can be used with third party Mobile development tools such as Xcode (iOS) Android Studio (Android) and Visual Studio (Windows Mobile, Windows UWP and Xamarin). SDKS are available on each platform standard repository (Bintray for Android, Cocoapods for iOS and Nuget for .NET)
+
+Convertigo Community edition brought to you by Convertigo SA (Paris & San Francisco). The platform is currently used by more than 100K developers worldwide, building enterprise class mobile apps.
+
+> [www.convertigo.com](https://www.convertigo.com)
+
+%%LOGO%%
+
+# How to use this image
+
+## Quick start
+
+	$ docker run --name C8O -d -p 28080:28080 convertigo
+
+This will start a container running the minimum Convertigo MBaaS server. Convertigo MBaaS uses images' **/workspace** directory to store configuration file and deployed projects as an Docker volume.
+
+You can access the Server admin console on http://[dockerhost]:28080/convertigo and login using the default credentials: admin / admin
+
+## Link Convertigo to a CouchDB database for FullSync (Convertigo EE only)
+
+Convertigo MBaaS FullSync module uses Apache CouchDB 1.6.1 as NoSQL repository. You can use the **[couchdb](https://hub.docker.com/_/couchdb/)** docker image and link to it convertigo this way
+
+Launch CouchDB container and name it 'fullsync'
+
+	docker run -d --name fullsync couchdb:1.6.1
+
+Then launch Convertigo and link it to the running 'fullsync' container. Convertigo MBaaS sever will automatically use it as its fullsync repository.
+
+	docker run -d --name C8O-MBAAS --link fullsync:couchdb -p 28080:28080 convertigo
+
+## Link Convertigo to a Billing & Analytics database
+
+### MySQL
+
+MySQL is the recommended database for holding Convertigo MBaaS server analytics. You can use this command to run convertigo and link it to a running MySQL container. Change `[mysql-container]` to the container name, and `[username for the c8oAnalytics db]`, `[password for specified db user]` with the values for your MySQL configuration.
+
+	docker run -d --name C8O-MBAAS --link [mysql-container]:mysql -p 28080:28080                         \
+	    -e JAVA_OPTS="-Dconvertigo.engine.billing.enabled=true                                           \ 
+	            -Dconvertigo.engine.billing.persistence.jdbc.username=[username for the c8oAnalytics db] \
+	            -Dconvertigo.engine.billing.persistence.jdbc.password=[password for specified db user]   \
+	            -Dconvertigo.engine.billing.persistence.jdbc.url=jdbc:mysql://mysql:3306/c8oAnalytics"   \
+	convertigo
+
+## Where is Convertigo MBaaS server storing deployed projects
+
+Projects are deployed in the Convertigo workspace, a simple file system directory. You can map the docker container **/workspace** to your physical system by using :
+
+	docker run --name C8O-MBAAS -v $(pwd):/workspace -d -p 28080:28080 convertigo
+
+You can share the same workspace by all Convertigo containers. This this case, when you deploy a project on a Convertigo container, it will be seen by others. This is the best way to build multi-instance load balanced Convertigo server farms.
+
+## Migrate from an earlier version of Convertigo
+
+-	Stop the container to perform a backup. And just back the workspace directory. This will backup all the projects definitions and some project data.
+-	Start a new Convertigo MBaaS docker container mapping the workspace
+-	All the workspace (Projects) will be automatically migrated to the new Convertigo MBaaS version
+
+## Security
+
+The default administration account of a Convertigo serveur is **admin** / **admin** and the **testplatform** is anonymous.
+
+These accounts can be configured through the *administration console* and saved in the **workspace**.
+
+### `CONVERTIGO_ADMIN_USER` and `CONVERTIGO_ADMIN_PASSWORD` variables
+
+You can change the default administration account :
+
+	docker run -d --name C8O-MBAAS -e CONVERTIGO_ADMIN_USER=administrator -e CONVERTIGO_ADMIN_PASSWORD=s3cret -p 28080:28080 convertigo
+
+### `CONVERTIGO_TESTPLATFORM_USER` and `CONVERTIGO_TESTPLATFORM_PASSWORD` variables
+
+You can lock the **testplatform** by setting the account :
+
+	docker run -d --name C8O-MBAAS -e CONVERTIGO_TESTPLATFORM_USER=tp_user -e CONVERTIGO_TESTPLATFORM_PASSWORD=s3cret -p 28080:28080 convertigo
+
+## `JAVA_OPTS` Environment variable
+
+Convertigo is based on a *Java* process with some defaults *JVM* options. You can override our defaults *JVM* options with you own.
+
+Add any *Java JVM* options such as -Xmx or -D[something]
+
+	docker run -d --name C8O-MBAAS -e JAVA_OPTS="-Xmx4096 -DjvmRoute=server1" -p 28080:28080 convertigo
+
+## Pre configurated Docker compose stack
+
+You can use this [stack](https://github.com/convertigo/docker/blob/master/compose/mbaas/docker-compose.yml) to run a complete Convertigo MBaaS server with FullSync repository and MySQL analytics in a few command lines.
+
+	mkdir c8oMBaaS
+	cd c8oMBaaS
+	wget https://raw.githubusercontent.com/convertigo/docker/master/compose/mbaas/docker-compose.yml
+	docker-compose up -d

convertigo/github-repo

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+https://github.com/convertigo/docker

convertigo/license.md

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+Convertigo Community Edition MBaaS image is licenced under [AGPL 3.0](http://www.gnu.org/licenses/agpl-3.0.html)