Added COMPILING.txt.

COMPILING.txt

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+Compiling
+---------
+
+Compiling WorldEdit requires a number of dependencies due to its dual
+support for hMod and Bukkit. However, if you only need to compile WorldEdit
+for one or the other, then you only need to compile the relevant files.
+(Note that the build script doesn't support compiling for only one or
+the other yet.)
+
+Requirements:
+- JDK 1.6 or newer
+- Apache Ant
+
+Main dependencies:
+- truezip.jar (TrueZip)
+    Downloads at http://repo1.maven.org/maven2/de/schlichtherle/truezip/
+
+hMod dependencies:
+- Minecraft_Mod.jar (hMod)
+- minecraft_server.jar (Server as distributed by Notch)
+
+Bukkit dependencies:
+- minecraft_server_cb.jar (Server as distributed by the Bukkit team; this
+    version has classes renamed to be friendly and thus is not compatible
+    with Notch's server distribution)
+- CraftBukkit.jar
+- Bukkit.jar
+
+All of the files for hMod support reside in the default namespace (root
+src/ folder). You can choose to not compile those files (or delete them
+altogether) if you do not need hMod support.
+
+For Bukkit support, the files can be found in com.sk89q.worldedit.bukkit,
+and you can ignore or delete those files if you do not need Bukkit support.
+Note that WorldEdit ties itself to CraftBukkit specifically because one,
+the Bukkit API currently lacks some features that allow generated trees
+to be undone, and second, there is no other implementation of Bukkit (yet).
+
+To compile, place library .jar files into a lib/ folder and run the
+Ant build script with the following line:
+    ant jar