Deleted old README file.

README was superseded by README.md and should have been deleted in 803d692.

README

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-leveldb: A key-value store
-Authors: Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)
-
-The code under this directory implements a system for maintaining a
-persistent key/value store.
-
-See doc/index.html for more explanation.
-See doc/impl.html for a brief overview of the implementation.
-
-The public interface is in include/*.h.  Callers should not include or
-rely on the details of any other header files in this package.  Those
-internal APIs may be changed without warning.
-
-Guide to header files:
-
-include/db.h
-    Main interface to the DB: Start here
-
-include/options.h
-    Control over the behavior of an entire database, and also
-    control over the behavior of individual reads and writes.
-
-include/comparator.h
-    Abstraction for user-specified comparison function.  If you want
-    just bytewise comparison of keys, you can use the default comparator,
-    but clients can write their own comparator implementations if they
-    want custom ordering (e.g. to handle different character
-    encodings, etc.)
-
-include/iterator.h
-    Interface for iterating over data. You can get an iterator
-    from a DB object.
-
-include/write_batch.h
-    Interface for atomically applying multiple updates to a database.
-
-include/slice.h
-    A simple module for maintaining a pointer and a length into some
-    other byte array.
-
-include/status.h
-    Status is returned from many of the public interfaces and is used
-    to report success and various kinds of errors.
-
-include/env.h
-    Abstraction of the OS environment.  A posix implementation of
-    this interface is in util/env_posix.cc
-
-include/table.h
-include/table_builder.h
-    Lower-level modules that most clients probably won't use directly