Add PR template and CHANGELOG (#28)

.github/PULL_REQUEST_TEMPLATE.md

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+## Proposed Changes
+
+_(Describe your changes here. Also describe the motivation for your changes: what problem do they solve, or how do they improve the application or codebase? If this pull request fixes an open issue, [use a keyword to link this pull request to the issue](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword).)_
+
+...
+
+<details>
+<summary>Screenshots of your changes (if applicable)</summary>
+
+</details>
+
+## Type of Change
+
+_(Write an `X` or a brief description next to the type or types that best describe your changes.)_
+
+| Type                                                                                    | Applies? |
+| --------------------------------------------------------------------------------------- | -------- |
+| 🚨 _Breaking change_ (fix or feature that would cause existing functionality to change) |          |
+| ✨ _New feature_ (non-breaking change that adds functionality)                          |          |
+| 🐛 _Bug fix_ (non-breaking change that fixes an issue)                                  |          |
+| 🎨 _User interface change_ (change to user interface; provide screenshots)              |          |
+| ♻️ _Refactoring_ (internal change to codebase, without changing functionality)          |          |
+| 🚦 _Test update_ (change that _only_ adds or modifies tests)                            |          |
+| 📚 _Documentation update_ (change that _only_ updates documentation)                    |          |
+| 📦 _Dependency update_ (change that updates a dependency)                               |          |
+| 🔧 _Internal_ (change that _only_ affects developers or continuous integration)         |          |
+
+## Checklist
+
+_(Complete each of the following items for your pull request. Indicate that you have completed an item by changing the `[ ]` into a `[x]` in the raw text, or by clicking on the checkbox in the rendered description on GitHub.)_
+
+Before opening your pull request:
+
+-   [ ] I have performed a self-review of my changes.
+    -   Check that all changed files included in this pull request are intentional changes.
+    -   Check that all changes are relevant to the purpose of this pull request, as described above.
+-   [ ] I have added tests for my changes, if applicable.
+    -   This is **required** for all bug fixes and new features.
+-   [ ] I have updated the project documentation, if applicable.
+    -   This is **required** for new features.
+-   [ ] If this is my first contribution, I have added myself to the list of contributors.
+-   [ ] I have updated the project Changelog (this is required for all changes).
+
+After opening your pull request:
+
+-   [ ] I have verified that the CI tests have passed.
+-   [ ] I have reviewed the test coverage changes reported by Coveralls.
+-   [ ] I have [requested a review](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/requesting-a-pull-request-review) from a project maintainer.
+
+## Questions and Comments
+
+_(Include any questions or comments you have regarding your changes.)_

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## Unreleased
+
+### 🚨 Breaking changes
+
+### ✨ Enhancements
+
+### 🐛 Bug fixes
+
+### 📚 Documentation and demo website changes
+
+### 🔧 Internal changes
+
+-   Added a changelog and pull request template.
+
+## [0.1.0] - 2024-04-16
+
+Initial release to [NPM](https://www.npmjs.com/package/memory-viz).
+For changes up to this release, see the [commit history](https://github.com/david-yz-liu/memory-viz/commits/master/).