Add license & readme

Author: thbar

LICENSE

@@ -0,0 +1,5 @@
+Copyright (c) LoGeek SARL
+
+Kiba Common is an Open Source project licensed under the terms of
+the LGPLv3 license.  Please see <http://www.gnu.org/licenses/lgpl-3.0.html>
+for license text.

README.md

@@ -0,0 +1,15 @@
+Kiba Common is a companion gem to [Kiba](https://github.com/thbar/kiba) and [Kiba Pro](https://github.com/thbar/kiba/blob/master/Pro-Changes.md) in which I'll share commonly used helpers.
+
+Please consider it a work-in-progress for the time being.
+
+In particular, review the changes when updating, until a proper release is ready.
+
+## Contributing & Legal
+
+(agreement below borrowed from Sidekiq Legal)
+
+By submitting a Pull Request, you disavow any rights or claims to any changes submitted to the Kiba Common project and assign the copyright of those changes to LoGeek SARL.
+
+If you cannot or do not want to reassign those rights (your employment contract for your employer may not allow this), you should not submit a PR. Open an issue and someone else can do the work.
+
+This is a legal way of saying "If you submit a PR to us, that code becomes ours". 99.9% of the time that's what you intend anyways; we hope it doesn't scare you away from contributing.