Add a basic initial README
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+JIMFS
+=====
+
+JIMFS is an in-memory file system for Java 7 and above, implementing the
+[NIO.2 file system APIs](http://docs.oracle.com/javase/7/docs/api/java/nio/file/package-summary.html).
+
+Basic use
+---------
+
+The simplest way to use JIMFS is to just get a new `FileSystem` instance from the `Jimfs` class and
+start using it:
+
+```java
+// For a file system with Unix-style paths and attributes:
+FileSystem fs = Jimfs.newUnixLikeFileSystem();
+
+Path foo = fs.getPath("/foo");
+Files.createDirectory(foo);
+
+Files.write(foo.resolve("hello.txt"), ImmutableList.of("hello"), StandardCharsets.UTF_8);
+
+// Or for Windows:
+FileSystem fs = Jimfs.newWindowsLikeFileSystem();
+```
+
+License
+-------
+
+```
+Copyright 2013 Google Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+```
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