Create CONTRIBUTING.md

.github/CONTRIBUTING.md

@@ -0,0 +1,23 @@
+# Contributing to SOEM/SOES
+
+Thanks for taking the time to contribute to SOEM/SOES! :+1:
+
+The following is a set of guidelines for contributing to SOEM/SOES. (These are just guidelines, not rules, use your best judgment.)
+
+
+## Contributor License Agreement
+
+If you want to contribute to SOEM or SOES you will need to sign a 
+Contributor License Agreement and send it to us either by e-mail or by physical mail.
+More information is available in this [PDF](https://openethercatsociety.github.io/cla/cla_soem_soes.pdf).
+
+
+
+## Commits and commit messages
+
+ * Squash your commits into logical units of work
+ * Use the present tense ("Add feature" not "Added feature")
+ * Use the imperative mood ("Read register..." not "Reads register...")
+ * Limit the first line to 72 characters or less
+ * Reference issues and pull requests if possible
+