add gitea templates

.gitea/issue_template/FEATURE_TEMPLATE.yml

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+name: New feature
+about: Use this template if you want to request a feature
+title: "[FEATURE] "
+labels:
+  - Kind/Enhancement
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this feature request!
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Describe the feature.
+    validations:
+      required: true
+
+  - type: textarea
+    id: benefits
+    attributes:
+      label: Benefits
+      description: Describe the benefits of this feature.
+    validations:
+      required: true
+
+  - type: textarea
+    id: extra
+    attributes:
+      label: More informations
+      description: If you want to share more things, this is here!
+    validations:
+      required: false

.gitea/issue_template/ISSUE_TEMPLATE.yml

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+name: New issue
+about: Use this template if you have a bug
+title: "[Bug] "
+labels:
+  - Kind/Bug
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      value: |
+        * i3 wallpaper manager version: 
+        * i3-wm version: 
+        * Operating system and version: 
+    validations:
+      required: true
+
+  - type: textarea
+    id: configuration
+    attributes:
+      label: Configuration
+      value: |
+        ```
+        ```
+    validations:
+      required: false
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: How reproduce the bug?
+    validations:
+      required: false
+
+  - type: textarea
+    id: resuts
+    attributes:
+      label: Observed Results
+      description: What happened?
+    validations:
+      required: false
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Results
+      description: What should happen?
+    validations:
+      required: false
+
+  - type: textarea
+    id: extra
+    attributes:
+      label: More informations
+      description: If you want to share more things, this is here!
+    validations:
+      required: false

.gitea/issue_template/QUESTION_TEMPLATE.yml

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+name: New question
+about: Use this template when you don't know how to do something
+title: "[Question] "
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill information.
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      value: |
+        * i3 wallpaper manager version: 
+        * i3-wm version: 
+        * Operating system and version: 
+    validations:
+      required: true
+
+  - type: textarea
+    id: question
+    attributes:
+      label: Question
+    validations:
+      required: true

.gitea/issue_template/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Documentation
+    url: https://gitnet.fr/deblan/i3-wallpaper-manager
+    about: Official documentation web site
+  - name: Ask a question in our Matrix room
+    about: If you prefer a chat-like conversation or in need for quick help, this might be an alternative to opening an issue.
+    url: https://matrix.to/#/!QDcaVhvLZlhptPkGVi:neutralnetwork.org?via=neutralnetwork.org