Added a COMPILING.md file

COMPILING.md

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+Compiling
+=========
+
+You can compile FastAsyncWorldEdit as long as you have the [Java Development Kit (JDK)](http://www.oracle.com/technetwork/java/javase/downloads/index-jsp-138363.html) for Java 8.
+Newer versions of the JDK may not compile. 
+You only need one version of the JDK installed.
+
+The build process uses Gradle, which you do *not* need to download. FastAsyncWorldEdit is a multi-module project with two active modules:
+
+* `worldedit-core` contains the FastAsyncWorldEdit API
+* `worldedit-bukkit` is the Bukkit plugin
+
+## To compile...
+
+### On Windows
+
+1. Shift + right click the folder with FastAsyncWorldEdit's files and click "Open command prompt".
+2. `gradlew build`
+
+### On Linux, BSD, or Mac OS X
+
+1. In your terminal, navigate to the folder with FastAsyncWorldEdit's files (`cd /folder/of/fawe/files`)
+2. `./gradlew build`
+
+## Then you will find...
+
+You will find:
+
+* The core FastAsyncWorldEdit API in **worldedit-core/build/libs**
+* FastAsyncWorldEdit for Bukkit in **worldedit-bukkit/build/libs***
+
+If you want to use FastAsyncWorldEdit, use the `FastAsyncWorldEdit-1.15-#` version.
+
+## Other commands
+
+* `gradlew idea` will generate an [IntelliJ IDEA](http://www.jetbrains.com/idea/) module for each folder.
+
+_Possibly broken_:
+* `gradlew eclipse` will generate an [Eclipse](https://www.eclipse.org/downloads/) project for each folder.
+