add README

README.md

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+Crisp
+=====
+
+Crisp is one of Lisp dialect which is based on [mal](https://github.com/kanaka/mal) and implemented with [Crystal](https://github.com/manastech/crystal).
+This project is a toy box for my dynamic language ideas.
+
+<!-- ScreenShot -->
+
+## So Many Tasks
+
+- [ ] Refactorings
+  - [ ] Make `is_a?` guards more elegant
+  - [ ] Import test cases from Mal
+  - [ ] Add CI
+  - [ ] More OOP (`evaluator`)
+  - [ ] Use standard `readline` implementation
+  - [ ] Better lexer and parser
+  - [ ] Add examples
+- [ ] Add more language features using Crystal's semantics (e.g. union type)
+  - ...
+
+## Installation
+
+1. Install `crystal` command
+2. `$ crystal run /path/to/Crisp/src/crisp.cr`
+
+## Development Environment
+
+- OS X
+- Crystal 0.7.1
+
+## License
+
+Distributed under [the MIT License](http://opensource.org/licenses/MIT).
+
+```
+Copyright (c) 2015 rhysd
+```
+