doc: add contribution, PR template and guideline doc

Co-authored-by: Gaze <dev@gaze.network>

.github/CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct

.github/CONTRIBUTING.md

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+# Contributing
+
+Please note: we have a [code of conduct](https://github.com/gaze-network/gaze-indexer/blob/main/.github/CODE_OF_CONDUCT.md), please follow it in all your interactions with the Gaze Network project.
+
+## Pull Requests or Commits
+
+#### Message structured
+
+```plaintext
+<type>(optional scope):<description>
+```
+
+The `<type>` must be one of the following:
+
+> feat:, refactor:, fix:, doc:, style:, perf:, test:, chore:, ci:, build:
+
+- feat(runes): add Runes module to the project
+- refactor: change project structure
+- fix(btc): fix chain reorganization issue
+- doc: update \`run\` command documentation
+- style: fix linting issues
+- perf: improve performance of the bitcoin node datasource
+- test(runes): add unit tests for etching logic
+- chore: bump dependencies versions
+- ci: update CI configuration
+- build: update Dockerfile to use alpine
+
+# 👍 Contribute
+
+If you want to say **thank you** and/or support the active development of `Fiber`:
+
+1. Add a [GitHub Star](https://github.com/gaze-network/gaze-indexer/stargazers) to the project.
+2. Follow and mention our [Twitter (𝕏)](https://twitter.com/Gaze_Network).
+3. Write a review or tutorial on [Medium](https://medium.com/), [Dev.to](https://dev.to/) or personal blog.

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+Please provide a clear and concise description of the changes you've made and the problem they address. Include the purpose of the change, any relevant issues it solves, and the benefits it brings to the project. If this change introduces new features or adjustments, highlight them here.
+
+Fixes # (issue)
+
+## Type of change
+
+What types of changes does your code introduce to Appium?
+_Put an `x` in the boxes that apply_
+
+- [ ] Bugfix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Enhancement (improvement to existing features and functionality)
+- [ ] Documentation update (changes to documentation)
+- [ ] Performance improvement (non-breaking change which improves efficiency)
+- [ ] Code consistency (non-breaking change which improves code reliability and robustness)
+
+## Commit formatting
+
+Please follow the commit message conventions for an easy way to identify the purpose or intention of a commit. Check out our commit message conventions in the [CONTRIBUTING.md](https://github.com/gaze-network/gaze-indexer/blob/main/.github/CONTRIBUTING.md#pull-requests-or-commits)