added contributing file, fix #18

.Rbuildignore

@@ -5,4 +5,4 @@ README.Rmd
 .travis.yml
 ^NEWS\.md$
 ^Makefile$
-
+^CONTRIBUTING\.md$

CONTRIBUTING.md

@@ -0,0 +1,22 @@
+# CONTRIBUTING #
+
+### Please contribute!
+
+We love collaboration.
+
+### Bugs?
+
+* Submit an issue on the Issues page [here](https://github.com/ropenscilabs/getlandsat/issues)
+
+### Code contributions
+
+* Fork this repo to your Github account
+* Clone your version on your account down to your machine from your account, e.g,. `git clone https://github.com/<yourgithubusername>/getlandsat.git`
+* Make sure to track progress upstream (i.e., on our version of `getlandsat` at `ropenscilabs/getlandsat`) by doing `git remote add upstream https://github.com/ropenscilabs/getlandsat.git`. Before making changes make sure to pull changes in from upstream by doing either `git fetch upstream` then merge later or `git pull upstream` to fetch and merge in one step
+* Make your changes (bonus points for making changes on a new branch)
+* Push up to your account
+* Submit a pull request to home base at `ropenscilabs/getlandsat`
+
+### Questions? Get in touch: [scott@ropensci.org](mailto:scott@ropensci.org)
+
+### Thanks for contributing!