Merge pull request #1 from IGPenguin/feature/github-features

Add basic GitHub features

.github/CONTRIBUTING.md

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+## 💬 Contributing
+
+If you consider contributing to this repository, please follow the rules below.
+
+### 🕵️‍ Pull request requirements
+
+1. Implement everything thoroughly, omit any unused or temporary stuff.
+2. Ensure that all code and data changes have been properly tested.
+3. Review the visible output in the final UI and honor existing formatting.
+4. Briefly describe the benefits of your proposed source integration.
+
+### ✏️ Right to make changes
+
+Project maintainers have the right and responsibility to remove, edit, or reject any contributions based on their judgement.

.github/ISSUE_TEMPLATE.md

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+### 🐞 What's wrong?
+~Describe any issue you're experiencing.~
+### 💎 It would be better if...
+~Outline desired data or functional changes.~
+### 📂 These are my sources:
+~Provide any sources proving your point.~

.github/PULL_REQUEST_TEMPLATE.md

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+## ⚠️ Essential review checklist
+**I truthfully declare that all the following statements are true:**
+- [ ] This pull requests follows [the contribution rules](https://github.com/IGPenguin/hmm/blob/gh-pages/.github/CONTRIBUTING.md "the contribution rules").
+- [ ] New features are fully completed.
+- [ ] All changes have been properly tested.
+- [ ] Output formatting is satisfactory.
+- [ ] File diff has been examined thoroughly.
+
+## ⭐️ What's new?
+~Describe the beneficial effects of your proposed changes here.~