Added GLPv3 copyright and some hints on contributing

CONTRIBUTING.md

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+## GitHub Workflow
+
+Developing patches should follow this workflow:
+
+### Initial Setup
+
+1.  Fork on GitHub (click Fork button).  This creates your own working copy on github.
+2.  Clone to computer: `git clone git@github.com:<<Your Github Username>>/speedtest.git`
+3.  cd into your repo: `cd speedtest`
+4.  Set up remote upstream: `git remote add -f upstream git://github.com/zpeters/speedtest.git`
+
+### Adding a Feature
+
+1.  Create a branch for the new feature: `git checkout -b my_new_feature`
+2.  Work on your feature, add and commit as usual
+
+Creating a branch is not strictly necessary, but it makes it easy to delete your branch when the feature has been merged into upstream, diff your branch with the version that actually ended in upstream, and to submit pull requests for multiple features (branches).
+
+### Pushing to GitHub
+
+8.  Push branch to GitHub: `git push origin my_new_feature`
+9.  Issue pull request: Click Pull Request button on GitHub

COPYING

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+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.