Added a PR template. Closes #673

Author: ckenst

.github/pull_request_template.md

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+
+# Pull Request Template: Add a Conference or Workshop
+
+Thank you for contributing! Most PRs are to add a new conference or workshop. Please fill out the following details:
+
+## Conference/Workshop Details
+- **Name:**
+- **Location (City, Country or Online):**
+- **Date(s):**
+- **Website URL:**
+- **X/Twitter (optional):**
+- **Status (Registration is Open, CFP is Open):**
+
+## Checklist
+- [ ] I have added the conference/workshop to the correct YAML file (`_data/current.yml` or `_data/past.yml`)
+- [ ] The entry includes name, location, date(s), url and accurate status
+- [ ] The entry is in chronological order (soonest to furtherest away)
+- [ ] If there are any special characters in the name field (`:` or `;` or `'`), the name must be in quotes (`"`)
+- [ ] I have checked for duplicates to avoid listing the same event twice
+
+## Additional context
+Add any other context or screenshots about the pull request here.