add license and ci

.travis.yml

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+sudo: false
+language: go
+
+go:
+  - 1.3
+  - 1.4
+  - 1.5
+
+script: go test -v -cover -race
+
+notifications:
+  email:
+    - u@gogs.io

LICENSE

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+Copyright (c) 2015 All Gogs Contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# Git Shell [![Build Status](https://travis-ci.org/gogits/git-shell.svg?branch=master)](https://travis-ci.org/gogits/git-shell)
+
+Package git-shell provides Git access through shell commands.
+
+## Limitations
+
+- Go version must be at least **1.3**.
+- Git version must be no less than **1.7.1**, and great than or equal to **1.8.0** is recommended.
+- For Windows users, try use as higher version as possible.
+
+## License
+
+This project is under the MIT License. See the [LICENSE](LICENSE) file for the full license text.