chore: CONTRIBUTING.md (#104)

* chore: CONTRIBUTING.md

Signed-off-by: Skye Gill <[email protected]>

Author: skyerus

CONTRIBUTING.md

@@ -0,0 +1,17 @@
+Welcome!
+
+There are a few things to consider before contributing to the sdk.
+
+Firstly, there's [a code of conduct](https://github.com/open-feature/.github/blob/main/CODE_OF_CONDUCT.md).
+TLDR: be respectful.
+
+Vendor specific details are intentionally not included in this module in order to be lightweight and agnostic.
+If there are changes needed to enable vendor specific behaviour in code or other extension points, check out [the spec](https://github.com/open-feature/spec).
+
+Any contributions are expected to include unit tests. These can be validated with `make test` or the automated github workflow will run them on PR creation.
+
+The go version in the `go.mod` is the currently supported version of go.
+
+When writing a test to cover a spec requirement use the test naming convention `TestRequirement_x_y_z` where `x_y_z` is the numbering of the spec requirement (e.g. spec requirement `1.1.1` demands a test with name `TestRequirement_1_1_1`). Also include the description of the test requirement as a comment of the test.
+
+Thanks! Issues and pull requests following these guidelines are welcome.