MOL-550: Add contribution guidelines

docs/contribution/ContributionGuidelines.md

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+# Contribution Guide
+
+* [Prerequisites](#prerequisites)
+* [Development](#development)
+
+## Prerequisites
+
+To merge your changes, your commits must be [signed](https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits).
+
+Minimum requirements are:
+- **Node.js** version 18
+- **Npm** npm v10.7.0
+- **Bash** shell
+- **Signed** git commits
+
+You can install all dependencies using `npm` with following command:
+
+```
+npm install
+```
+
+## Development
+While developing project you can use some predefined commands for running tests, running linter or generating coverage.
+
+- Execute `npm run test` to run all tests.
+- Execute `npm run lint` to show lint errors in the code.
+
+## Release procedure
+At the moment there is no automated release scripts, which means we do releases manually. We use [gitflow workflow](https://www.atlassian.com/git/tutorials/comparing-workflows/gitflow-workflow) for releases. Please **squash commits when finishing the feature branch**, this way we can keep relatively clean history on develop and main. 
+
+Contributing by following these steps:
+
+1. Create and check out a new branch off main and make your necessary change here. The branch name should have a specific prefix depends on the purpose, e.g: `bugfix/`, `feat/`
+2. Bump [version](https://semver.org/) on npm package (in /processor). Commit changes on the above branch.
+3. Create PR and wait for the approval from the development team.

docs/contribution/IssueTemplate.md

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+# Issue Template
+
+**Deployment**  
+_My deployment is on:_
+
+- [ ] Docker
+- [ ] AWS Lambda
+- [ ] GCP
+- [ ] Azure
+- [ ] Other _Please specify:_
+
+**Expected behaviour**
+
+_Please explain what should happen._
+
+**Actual behaviour**
+
+_Please explain what is happening instead. Provide a log message if relevant._
+
+**Attempted fixes**
+
+_Please explain what you've done so far to try and fix the problem._
+
+**Please provide more information about how this can be reproduced. Please include jsfiddle links, code snippets or any other necessary information**
+
+_Include extra info here._