🔧 Add GitHub templates for discussions and issues, and security policy (#1105)

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Security Contact
+    about: Please report security vulnerabilities to security@tiangolo.com
+  - name: Question or Problem
+    about: Ask a question or ask about a problem in GitHub Discussions.
+    url: https://github.com/tiangolo/full-stack-fastapi-template/discussions/categories/questions
+  - name: Feature Request
+    about: To suggest an idea or ask about a feature, please start with a question saying what you would like to achieve. There might be a way to do it already.
+    url: https://github.com/tiangolo/full-stack-fastapi-template/discussions/categories/questions

.github/ISSUE_TEMPLATE/privileged.yml

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+name: Privileged
+description: You are @tiangolo or he asked you directly to create an issue here. If not, check the other options. 👇
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for your interest in this project! 🚀
+
+        If you are not @tiangolo or he didn't ask you directly to create an issue here, please start the conversation in a [Question in GitHub Discussions](https://github.com/tiangolo/full-stack-fastapi-template/discussions/categories/questions) instead.
+  - type: checkboxes
+    id: privileged
+    attributes:
+      label: Privileged issue
+      description: Confirm that you are allowed to create an issue here.
+      options:
+        - label: I'm @tiangolo or he asked me directly to create an issue here.
+          required: true
+  - type: textarea
+    id: content
+    attributes:
+      label: Issue Content
+      description: Add the content of the issue here.