Issue and Pull Request templates

.github/ISSUE_TEMPLATE.md

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+**Please describe the problem you are having in as much detail as possible**:
+
+
+**Further details**:
+
+- Xiao version:
+- Priority this issue should have – please be realistic and elaborate if possible:
+
+- [ ] I found this issue while self-hosting the bot.
+  - Node.js version:
+  - Commit hash:
+  - Operating system:

.github/PULL_REQUEST_TEMPLATE.md

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+**Please describe the changes this PR makes and why it should be merged**:
+
+
+**Semantic versioning classification:**  
+- This PR changes the bot's code in some way
+  - [ ] SEMVER patch (bug fix)
+  - [ ] SEMVER minor (commands or args added)
+  - [ ] SEMVER major (commands removed or renamed, args moved or removed)
+- [ ] This PR **only** includes non-code changes, like changes to the README.