add .travis.yml and Projectfile

.travis.yml

@@ -0,0 +1,8 @@
+language: c
+before_install: |
+  curl http://dist.crystal-lang.org/apt/setup.sh | sudo bash
+  sudo apt-get -q update
+install: |
+  sudo apt-get install crystal
+script:
+  - crystal build crisp.cr

Projectfile

@@ -0,0 +1 @@
+# No dependency

README.md

@@ -1,6 +1,8 @@
 Crisp
 =====
 
+[![Build Status](https://travis-ci.org/rhysd/Crisp.svg)](https://travis-ci.org/rhysd/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.