Add .travis.yml and a badge of travis-ci

.travis.yml

@@ -0,0 +1,21 @@
+sudo: required
+dist: trusty
+
+language: c
+
+addons:
+  apt:
+    packages:
+    - libgmp-dev
+
+before_install:
+- mkdir -p ~/.local/bin
+- export PATH=$HOME/.local/bin:$PATH
+- travis_retry curl -sSL https://get.haskellstack.org/ | sh
+
+script:
+- stack --no-terminal --install-ghc test
+
+cache:
+  directories:
+  - $HOME/.stack

README.md

@@ -1,6 +1,8 @@
 ImplicitCAD: Math Inspired CAD
 ==============================
 
+[![Hackage version](https://img.shields.io/hackage/v/implicit.svg?style=flat)](https://hackage.haskell.org/package/implicit)  [![Build Status](https://travis-ci.org/colah/ImplicitCAD.png?branch=master)](https://travis-ci.org/colah/ImplicitCAD)
+
 Introduction
 ------------