Add CONTRIBUTING.md (#94)

Michelle Sintov · Michelle Sintov · commit 6e327444a623 · 2019-02-01T14:13:36.000-08:00
diff --git a/sdk/CONTRIBUTING.md b/sdk/CONTRIBUTING.md
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+We accept contributions from 3rd parties as long as you first complete an individual CLA (Contributor License Agreement):
+
+http://go.anki.com/individual-cla
+
+If your employer(s) have rights to intellectual property that you create, and that includes your contributions, then we also require a separate Corporate CLA from them:
+
+http://go.anki.com/corporate-cla
+
+Please also review our: [Code Style Guide](CODESTYLE.md)
