Update issue templates (#504)

* Update issue templates

[skip ci]

* Format

Author: nakamura-to

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,34 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+(Describe the problem clearly and concisely.)
+
+**Expected behavior**
+(Describe the expected behavior clearly and concisely.)
+
+**Actual behavior**
+(Describe the actual behavior clearly and concisely.)
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1.
+2.
+3.
+
+**Screenshots**
+(If applicable, add screenshots to help explain your problem.)
+
+**Environment (please complete the following information):**
+- Doma version or git rev:
+- Output of `java -version`:
+- Build tool (ie. output of `mvnw --version` or `gradlew --version`):
+
+**Additional context**
+(Add any other context about the problem here.)

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,14 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Description**
+(Describe the feature here.)
+
+**Implementation ideas**
+(If you have any implementation ideas, they can go here)