Enrich ISSUE_TEMPLATE

Close #1932

.github/ISSUE_TEMPLATE

-<!--
-Thanks for your contribution.
-
-When you report a bug or suggest a new feature, please include these information.
-* Your browser
-* Desktop version or mobile version
-
---------
-
-Misskeyへの貢献ありがとうございます。
-
-バグの報告や提案などで、可能であれば以下の情報を含めてください。
-* お使いのブラウザ
-* デスクトップ版Misskeyかモバイル版Misskeyか
-
--->

.github/ISSUE_TEMPLATE/bug_report.md

+---
+name: Bug Report
+about: Create a report to help us improve
+---
+
+# Summary
+<!-- Tell us what the bug is -->
+
+# Expected Behavior
+<!--- Tell us what should happen -->
+
+# Actual Behavior
+<!--- Tell us what happens instead of the expected behavior -->
+
+# Steps to Reproduce
+1.
+2.
+3.
+
+# Environment
+<!-- Tell us where on the platform it happens -->
+<!-- e.g. desktop or mobile version, your browser, operating system -->
+

.github/ISSUE_TEMPLATE/feature_request.md

+---
+name: Feature Request
+about: Suggest an idea for this project
+---
+
+# Summary
+<!-- Tell us what the suggestion is -->
+
+# Environment
+<!-- Tell us where on the platform it related -->
+<!-- e.g. desktop or mobile version, your browser, operating system -->