contributing guidelines

CONTRIBUTING.md

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+# Contributing to `packer-builder-vultr`
+
+We would love to get your feedback, thoughts, and overall improvements to `packer-builder-vultr`! 
+
+## Overview
+
+- All Code should run through `go fmt`
+
+## Getting started
+
+Packer-builder-vultr supports `go modules` so you can pull down the repo outside of your `$GOPATH`.
+
+You can also run:
+`go get -u github.com/vultr/packer-builder-vultr`
+
+## Versioning 
+
+Packer-builder-vultr follows [SemVer](http://semver.org/) for versioning. New functionality will result in a increment to the minor version. While, 
+bug fixes will result in a increment to the patch version. 
+
+## Releases
+Releases of new versions are done as their independent pull requests - They will also be done by the maintainers.
+
+To release a new version of `packer-builder-vultr` we must do the following.
+
+- Make the appropriate updates to `CHANGELOG.md`. This should include the 
+    - Version, 
+    - List of fix/features with accompanying pull request ID
+    - Description of each fix/feature
+
+```
+## v0.0.1 (2019-06-12)
+
+### Fixes
+* Fixed random bug #12
+```
+- Submit a pull request with the following changes
+- Once the pull request is merged in - create a new tag and publish.