Add README

Author: agaricusb

README.md

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+# ForgeAPI
+
+This project generates an API jar with symbols for building Minecraft Forge mods.
+
+Only symbols are included (net.minecraft, net.minecraftforge, etc.) so you can build
+your mod against this API jar, but running it requires Minecraft.
+
+To use in your project, inherit from: https://github.com/agaricusb/ForgeMod