add minimal README

.travis.yml

@@ -5,6 +5,7 @@ os:
   - osx
 julia:
   - 1.0
+  - 1.1
   - nightly
 notifications:
   email: true

README.md

@@ -1,2 +1,7 @@
 # Groups
 [![Build Status](https://travis-ci.org/kalmarek/Groups.jl.svg?branch=master)](https://travis-ci.org/kalmarek/Groups.jl)
+[![codecov](https://codecov.io/gh/kalmarek/Groups.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/kalmarek/Groups.jl)
+
+A very rudimentary implementation of finitely-presented groups (syllable representation). Relatively complete are only [automorphism groups of free groups](https://github.com/kalmarek/Groups.jl/blob/master/src/AutGroup.jl) and [wreath products](https://github.com/kalmarek/Groups.jl/blob/master/src/WreathProducts.jl) (which are not finitely-presented, but based on the standard normal form).
+
+Have a look into `test` directory for eample use.