chore(Monocle): Update README.md.

README.md

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+Monocle is the implementation of the Glass windowing component of JavaFX for embedded systems. It
+is part of the Java Platform since version 8u20, but not included in builds for desktop platforms
+(Windows, Linux, Mac).
+
+This repository provides pre-packaged builds of Monocle taken from the OpenJFX project. The builds
+include components to run in headless environments. They do not include native libraries for
+low-level access.
+
+## Build (under Windows)
+
+Clone the repository and checkout the branch.
+
+```
+C:\> git clone https://github.com/TestFX/Monocle
+C:\> cd Monocle
+C:\> git checkout runtime-8u20
+```
+
+Choose the JDK version and build the jars.
+
+```
+C:\> set JAVA_HOME=C:\Program Files\Java\jdk1.8.0_20
+C:\> gradlew clean jar
+C:\> dir build\libs
+```
+
+## Update Instructions
+
+To update the build to newer versions of Monocle just copy source code files from
+[src/main/java/com/sun/glass/ui/monocle] into the directory `src\main\java` and resource files
+from [src/main/resources/com/sun/glass/ui/monocle] into the directory `src\main\resources`. Use
+the links `bz2`, `zip` or `gz` to export the files as archive.
+
+You can update to a certain version by changing `tip` in the URLs to a changeset hash. There is a
+list of changeset hashes at [http://hg.openjdk.java.net/openjfx/8u-dev/rt/tags]().
+
+Example changeset hashes:
+
+- **8u20-b26:** `e56a8bbcba20` instead of `tip`.
+- **8u25-b18:** `b2021af209c3` instead of `tip`.
+- **8u40-b13:** `b90398073b6a` instead of `tip`.
+
+[src/main/java/com/sun/glass/ui/monocle]: http://hg.openjdk.java.net/openjfx/8u-dev/rt/file/tip/modules/graphics/src/main/java/com/sun/glass/ui/monocle
+[src/main/resources/com/sun/glass/ui/monocle]: http://hg.openjdk.java.net/openjfx/8u-dev/rt/file/tip/modules/graphics/src/main/resources/com/sun/glass/ui/monocle