feat: add pr template

.github/auto_assign.yml

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+# Set to true to add reviewers to pull requests
+addReviewers: true
+
+# Set to true to add assignees to pull requests
+addAssignees: true
+
+# A list of reviewers to be added to pull requests (GitHub user name)
+reviewers:
+  - Draply
+  - 0x5ea000000
+  - hduoc2003
+  - zk-steve
+  - Tranduy1dol
+  - VanhGer
+
+# A list of keywords to be skipped the process that add reviewers if pull requests include it
+skipKeywords:
+  - wip
+
+# A number of reviewers added to the pull request
+# Set 0 to add all the reviewers (default: 0)
+numberOfReviewers: 0

.github/pull_request_template.md

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+# Check List
+
+- [ ] Don't forget to squash commits into meaningful chunks before merging
+- [ ] Check every test passed.
+- [ ] Did you split imports into std and custom parts?
+- [ ] Have you updated the consts in ORN?
+- [ ] Have you run ORN with the latest version?
+- [ ] Check your commit messages.
+- [ ] Have you added meaningful comments?
+- [ ] Don't forget to optimize gas cost!
+  - [ ] Calling vector::length() multiple times is expensive (e.g. in loops), save it to a variable instead.
+  - [ ] Consider using consts for things that can be pre-computed.
+  - [ ] `pow(2, x) => (1 << x+1)`
+  - [ ] `inline` short functions to save gas.
+  - [ ] Find all vector::empty() in all files and replace them with the first append
+  - [ ] Use vector::\*\_reverse\_\*() version to save gas.
+- [ ] Check Visibility of functions