add: GitHub templates

This commit adds issue and PR templates for FastLink project.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Ask for a new feature to be added
+title: "[FR]: "
+labels: ["enhancement", "not confirmed"]
+
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear and concise description of what the feature is.
+    validations:
+      required: true
+
+  - type: textarea
+    id: reason
+    attributes:
+      label: Reason
+      description: Why should this feature be added?
+    validations:
+      required: true
+
+  - type: textarea
+    id: example
+    attributes:
+      label: Example code
+      description: If you have an example of how this feature should be implemented, please share it here.
+    validations:
+      required: false
+
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Confirmations
+      description: The following confirmations are required to open a feature request.
+      options:
+        - label: This feature is not already implemented.
+          required: true
+        - label: I have verified that this is not a duplicate feature request.
+          required: true

.github/ISSUE_TEMPLATE/issue_template.yml

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+name: Issue report
+description: Report an issue
+title: "[BUG]: "
+labels: ["bug", "not confirmed"]
+
+body:
+  - type: input
+    id: version
+    attributes:
+      label: FastLink version
+      description: The version of FastLink you're using.
+    validations:
+      required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear and concise description of what the bug is.
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: Steps to reproduce the behavior.
+    validations:
+      required: true
+
+  - type: textarea
+    id: example
+    attributes:
+      label: Example code
+      description: If you have an example of how to reproduce the bug, please share it here.
+    validations:
+      required: false
+
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Confirmations
+      description: The following confirmations are required to open a bug report.
+      options:
+        - label: My environment meets the minimum requirements.
+          required: true
+        - label: I have verified that this is not a duplicate issue.
+          required: true

.github/PULL_REQUEST_TEMPLATE.md

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+## Changes
+
+Write here about the changes you've made
+
+## Why 
+
+Write here why you think this should be merged
+
+## Checkmarks
+
+- [ ] The modified functions have been tested.
+- [ ] Used the same indentation as the rest of the project.
+
+## Additional information
+
+If you have any additional information, write it here