chore: initial pull request templates

.github/PULL_REQUEST_TEMPLATE/default.md

@@ -0,0 +1,9 @@
+---
+name: 'Default'
+about: Default Pull Request Template
+title: ''
+labels: ''
+assignees: ''
+---
+
+<!-- Please add as much info as you can! -->

.github/PULL_REQUEST_TEMPLATE/typescript_version_upgrade.md

@@ -0,0 +1,18 @@
+---
+name: 'TypeScript Version Upgrade'
+about: Used when upgrading the supported version of TypeScript
+title: ''
+labels: ''
+assignees: ''
+---
+
+**Please complete the following:**
+
+TypeScript version added by this PR: `{{ INSERT_TYPESCRIPT_VERSION }}`
+
+- [ ] I have updated the devDependency range in the root package.json
+- [ ] I have updated the range value in `packages/typescript-estree/src/parser.ts`
+- [ ] I have run the existing tests to make sure they still pass, or made any required updates
+- [ ] I have added new tests for the features introduced in this newer version of TypeScript
+  - New features tests added:
+    -