Add issue and PR templates.

.github/workflows/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To reproduce**
+Steps to reproduce the behavior:
+
+> Ex.
+>
+> 1. Install stactools
+> 2. Run `scripts/test`
+> 3. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots and shell session dumps**
+If applicable, add session dumps and/or screenshots to help explain your problem.
+
+> ex. `scripts/lint >> lint_errors.txt`
+
+**Additional context**
+Add any other context about the problem here.

.github/workflows/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen. Ex. I would like to use stac to do [...]
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/workflows/PULL_REQUEST_TEMPLATE.MD

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+Before you submit a pull request, please fill in the following:
+
+**Related Issue(s):**
+Please add links (if any) to related github issues.
+
+**Description:**
+Please explain the changes you made here.
+
+**PR checklist:**
+
+- [ ] Code is formatted (run `scripts/format`).
+- [ ] Code lints properly (run `scripts/lint`).
+- [ ] Tests pass (run `scripts/test`).
+- [ ] Documentation has been updated to reflect changes, if applicable.
+- [ ] Changes are added to the [CHANGELOG](../CHANGELOG.md).

CHANGELOG.md

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 # Changelog
 
+### Added
+
+- Added Issue and PR Templates
+### Fixed
+
+### Changed
+### Removed
+
 ## stactools 0.2.1a1
 
 ### Added