feat(contribution): create contribution guideline (CONTRIBUTING.md)

CONTRIBUTING.md

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+# Contribution guideline
+
+## Create a GitHub Pull Request
+
+### 1. Fork the repository
+### 2. Make changes, commit them to your fork
+ - As the release process is automated, write your commit message according to the [semantic-release documentation](https://github.com/semantic-release/semantic-release?tab=readme-ov-file#commit-message-format)'s default config
+### 3. Push your changes to your fork
+### 4. Create a pull request
+ - Go to https://github.com/emartech/escher-suiteapi-js/compare
+ - Select your fork and branch as head
+ - Select emartech/escher-suiteapi-js and master as base
+### 5. The code has to be approved and merged by a maintainer
+ - Ask the @js-maintainers user group on Slack for review