Added bug and PR templates

.github/issue_template/bug.yml

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+name: Bug report
+description: Use this to report something that is not working properly.
+labels: [bug]
+assignees: [garraflavatra]
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Bug description
+      description: Give a brief description of the bug. What feature is broken?
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Reproduction
+      description: Include a reproduction if applicable. What did you do before the bug appeared?
+    validations:
+      required: true
+
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: What version of Rolens are you running?
+    validations:
+      required: true
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant log output
+      description: Please copy and paste any relevant log output. This will be automatically formatted into code, so no need for backticks.
+      render: shell
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment information
+      description: Please open Rolens and select _Rolens > Open log directory_. Open the `environment.json` file and paste its contents here.
+      render: shell
+    validations:
+      required: true
+
+  - type: dropdown
+    id: severity
+    attributes:
+      label: Severity of this bug
+      options:
+        - Annoying
+        - Blocking a specific feature
+        - Blocking all usage
+    validations:
+      required: true

.github/issue_template/docs.yml

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+name: Documentation issue
+description: Report documentation issues here.
+labels: [documentation]
+assignees: [garraflavatra]
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this report!
+
+  - type: textarea
+    id: source
+    attributes:
+      label: Source
+      description: Which part of the documentation is erroneous? A link would be very nice!
+    validations:
+      required: true
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: Why is it wrong?
+    validations:
+      required: true
+
+  - type: input
+    id: solution
+    attributes:
+      label: Solution
+      description: What should the documentation say instead?

.github/issue_template/feature.yml

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+name: Feature request
+description: Do you have an idea that could extend Rolens's possibilities? This is the place to propose it.
+labels: [enhancement]
+assignees: [garraflavatra]
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to propose a new feature!
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Feature description
+      description: Give a brief description of the feature you'd like to see. What issue does it solve, and what is it capable of?
+    validations:
+      required: true
+
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: What version of Rolens are you running?
+    validations:
+      required: true
+
+  - type: dropdown
+    id: importance
+    attributes:
+      label: Importance
+      options:
+        - Nice to have
+        - It would make Rolens more complete
+        - I cannot use Rolens without it
+    validations:
+      required: true

.github/pull_request_template.md

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+<!--
+Thanks for taking the time to create a pull request!
+Before you send it, could you please give a short description of your changes below?
+Did you test your changes, and doesn't it break anything?
+-->
+
+...