Update issue templates (#11)

Author: nakamura-to

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+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.
+
+**Configuration**
+```properties
+# Add your application.properties here, if applicable.
+
+```
+
+**Screenshots**
+(If applicable, add screenshots to help explain your problem.)
+
+**Environment (please complete the following information):**
+ - Output of `uname -a` or `ver`: 
+ - Output of `java -version`: 
+ - GraalVM version (if different from Java): 
+ - Doma-Quarkus version or git rev:
+ - Doma version: 
+ - Quarkus 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

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+---
+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.)