Add README and travis.

.travis.yml

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+language: rust

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "simple-filesystem"
-version = "0.1.0"
+version = "0.0.1"
 authors = ["WangRunji <wangrunji0408@163.com>"]
 
 [dependencies]

README.md

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+# SimpleFileSystem
+
+A Rust implementation for SFS in [ucore_os_lab](https://github.com/chyyuu/ucore_os_lab) lab8.
+
+It will become a part of [RustOS](https://github.com/wangrunji0408/RustOS).
+
+Working in progress ...