chore: add contrib

Author: iru

CONTRIBUTE.md

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+# General
+
+- Use conventional commits https://www.conventionalcommits.org/en/v1.0.0/
+
+- Maintain example **diagrams** for a better understanding of the architecture and sysdig secure resources
+  - example diagram-as-code  https://github.com/sysdiglabs/terraform-aws-secure-for-cloud/blob/master/examples/single-account/diagram-single.py
+  - resulting diagram https://github.com/sysdiglabs/terraform-aws-secure-for-cloud/blob/master/examples/single-account/diagram-single.png
+
+- Useful Terraform development guides
+  - https://www.terraform-best-practices.com
+
+
+
+# Pull Request
+
+- Terraform lint and validation is enforced vía  https://pre-commit.com
+  - custom configuration at https://github.com/sysdiglabs/terraform-aws-secure-for-cloud/blob/master/.pre-commit-config.yaml
+- Testing (WIP)
+
+
+
+# Release
+
+- Use semver for releases https://semver.org
+- Module official releases will be published at terraform registry
+- Just create a tag/release and it will be  fetched by pre-configured webhook and published into.
+  - For internal usage, TAGs can be used
+  - For officual verions, RELEASEs will be used, with its corresponding changelog description.