Add a proper readme

README.md

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+# InfiniteFluids
+
+## Basics
+
+### What does this mod do?
+In vanilla Minecraft, when a water block is next to at least two source blocks,
+it becomes a source block itself, which allows collection of infinite water.
+This mod offers control over which fluids have this behavior. Currently, it
+makes lava act the same way in the Nether (as well as in mod-added dimensions
+where doesWaterVaporize is true, if any). In future versions, this will have a
+configuration and an API for controlling which fluids are infinite.
+
+### How do I use this mod?
+You need Minecraft Forge installed first. Once that's done, just drop
+infinitefluids-*version*.jar in your Minecraft instance's mods/ directory.
+
+## Development
+
+### How do I compile this mod from source?
+You need a JDK installed first. Start a command prompt or terminal in the
+directory you downloaded the source to. If you're on Windows, type
+`gradlew.bat build`. Otherwise, type `./gradlew build`. Once it's done, the mod
+will be saved to build/libs/infinitefluids-*version*.jar.
+
+### How do I develop this mod in Eclipse?
+Start a command prompt or terminal in the directory you downloaded the source
+to. If you're on Windows, type `gradlew.bat setupDecompWorkspace eclipse`.
+Otherwise, type `./gradlew setupDecompWorkspace eclipse`. Once it's done, start
+Eclipse and set the workspace to the "eclipse" subdirectory. Copy the dummy.jar
+file to the run/mods/ directory.
+
+### How can I contribute to this mod's development?
+Send pull requests. Note that by doing so, you agree to release your
+contributions under this mod's license.
+
+## Licensing/Permissions
+
+### What license is this released under?
+It's released under the LGPL v2.1 or later.
+
+### Can I use this in my modpack?
+Yes, even if you monetize it with adf.ly or something, and you don't need to
+ask me for my permission first.