Added a README.

Author: revnull

README.md

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+#FixFile
+
+This is a library for datatype-generic file serialization.
+
+##Features
+
+* Transaction-isolation via Multi-Version Concurrency Control (MVCC).
+* Append-only file format with a cavuum (garbage collection) feature.
+* Lazy reads that only read structures that are accessed.
+* Writes that only write modified structures.
+* Clear separation between I/O and manipulation of data structures.
+* Standard library providing implementations of sets and key-value stores.
+