Add doclet

doclet/README.md

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+# doclet
+
+This doclet generates the edn file used by the play-clj documentation.
+
+## Usage
+
+1. Download and extract the [LibGDX source code](https://github.com/libgdx/libgdx/releases)
+2. Run `lein uberjar` in this directory
+3. Run the following command in this directory:
+
+`javadoc -sourcepath ~/path/to/libgdx/gdx/src/ -subpackages com.badlogic -doclet play_clj_doclet.core.Start -docletpath target/play-clj-doclet-0.0.1-SNAPSHOT-standalone.jar`