Create contributing guide

Carlos Menezes · Carlos Menezes · commit 3a8378bce762 · 2018-07-11T16:46:54.000-03:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+# How to contribute
+
+You should feel free to contribute with Pull Requests.
+
+To help you with your contributions, it is nice to follow this structure when possible:
+
+- When should you use the documented practice?
+- What is this practice?
+- What are some applied examples? (both right and wrong)
+- Why is this the best solution? It's nice to have references here.
+- What are other diverging approaches, and why not use them?
