Adding readme file

README.md

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+# NBTExplorer
+
+NBTExplorer is an open-source NBT editor for all common sources of NBT data.  It's mainly intended for editing [Minecraft](http://www.minecraft.net) game data.
+
+## Supported Formats
+
+NBTExplorer supports reading and writing the following formats:
+
+* Standard NBT files (e.g. level.dat)
+* Schematic files
+* Uncompressed NBT files (e.g. idcounts.dat)
+* Minecraft region files (*.mcr)
+* Minecraft anvil files (*.mca)
+* Cubic Chunks region files (r2*.mcr, r2*.mca)
+
+## System Requirements
+
+### Windows
+
+Windows XP or later, .NET Framework 2.0 or later.
+
+### Linux
+
+NBTExplorer is compatible with recent Mono runtimes, at least 2.6 or later.
+Minimally, your system needs the `mono-core` and `mono-winforms` packages, or whatever package set is equivalent.
+
+### Mac
+
+A separate Mac version with a native UI is available.  All Mono dependencies are included within the app package.
+Minimum supported OS is OSX 10.8 Mountain Lion, but it may run on versions as early as Snow Leopard.
+
+The Windows version of NBTExplorer can still be used if the Mac version does not work.  You will need to install the
+Mono runtime, and then run NBTExplorer with Mono from the command line.