Add GitHub issue and PR templates. (#1)

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: "Bug Report"
+description: Report software deficiencies
+labels: ["bug"]
+body:
+- type: markdown
+  attributes:
+    value: |
+      Use this form to report any functional or performance bugs you've found in the software.
+      
+      Be sure to check if your [issue](https://github.com/y-scope/logback-appenders/issues) has 
+      already been reported.
+
+- type: textarea
+  attributes:
+    label: Bug
+    description: "Describe what's wrong and if applicable, what you expected instead."
+  validations:
+    required: true
+
+- type: input
+  attributes:
+    label: logback-appenders version
+    description: "The release version number or development commit hash that has the bug."
+    placeholder: "Version number or commit hash"
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Environment
+    description: "The environment in which you're using logback-appenders."
+    placeholder: "Platform, OS version, Java version, etc."
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Reproduction steps
+    description: "List all steps required to reproduce the bug."
+  validations:
+    required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: "Feature/Change Request"
+description: Request a feature or change
+labels: ["enhancement"]
+body:
+- type: markdown
+  attributes:
+    value: |
+      Use this form to request a feature/change in the software, or the project as a whole. 
+
+- type: textarea
+  attributes:
+    label: Request
+    description: "Describe your request and why it's important."
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Possible implementation
+    description: "Describe any implementations you have in mind."
+  validations:
+    required: true

.github/PULL_REQUEST_TEMPLATE.md

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+# Description
+<!-- Describe what this request will change/fix and provide any details necessary for reviewers -->
+
+
+# Validation performed
+<!-- What tests and validation you performed on the change -->
+