git: add issue templates

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,21 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+💚💜 Thank you for interest. ❤️💛
+Please make sure to check for more efficient package management. *Please prioritize checking existing issues first. I will repay with higher-quality code.*
+
+**To Reproduce**
+- [ ] I have read [README.md](https://github.com/dsdanielpark/Bard-API). Please read me.
+- [ ] I have searched for existing issues. *(Most of the issues are duplicates.)*
+
+----------Please delete the content above this line, including this line.-------------
+
+
+**Solution you'd like**
+A clear and concise description of what you want to happen.