[Github] Add Github template for new issues.

.github/ISSUE_TEMPLATE/Bug-Report.yml

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+name: Bug Report
+description: File a bug report
+title: "[Bug]: "
+labels: [Bug]
+body:
+    - type: markdown
+      attributes:
+          value: |
+              ## Important notice
+              As an open source project we love to work together with our community to improve and develop our products.
+              It's also important for us to make clear that **we're not working for you or your company**,
+              but we enjoy to work together to solve existing bugs.
+              So we would love to see PRs with bugfixes, discuss them and we are happy to merge them when they are ready.
+              For details see also our [contributing guidelines](https://github.com/pimcore/pimcore/blob/10.x/CONTRIBUTING.md).
+
+              Bug reports that do not meet the conditions listed below will be closed/deleted without comment.
+
+              - Bug was verified on the latest supported version.
+              - This is not a security issue -> see [our security policy](https://github.com/pimcore/pimcore/security/policy) instead.
+              - You are not able to provide a pull request that fixes the issue.
+              - There's no existing ticket for the same issue.
+    - type: input
+      attributes:
+          label: Version
+      validations:
+          required: true
+    - type: textarea
+      attributes:
+          label: Steps to reproduce
+      validations:
+          required: true
+    - type: textarea
+      attributes:
+          label: Expected / actual behavior
+      validations:
+          required: false

.github/ISSUE_TEMPLATE/Feature-Request.yml

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+name: Feature Request
+description: Request or propose a new feature
+title: "[Feature]: "
+labels: ["New Feature"]
+body:
+    - type: markdown
+      attributes:
+          value: |
+              ## Important notice
+              As an open source project we love to work together with our community to improve and develop our products.
+              It's also important for us to make clear that **we're not working for you or your company**,
+              but we enjoy to work together to improve or add new features to the product.
+              So we are always ready to discuss features and improvements with our community.
+              Especially for bigger topics, please [start a discussion](https://github.com/pimcore/pimcore/discussions) first to aviod unnecessary efforts.
+
+              As soon as a topic is more specific, feel free to create issues for it or even better provide a corresponding PR as we love to
+              review and merge contributions.
+
+              Feature requests that do not meet the conditions listed below will be closed/deleted without comment.
+              - There's no existing ticket for the same topic
+              - This is already a specific ready-to-work-on feature request
+
+    - type: textarea
+      attributes:
+          label: Feature description
+      validations:
+          required: true

.github/ISSUE_TEMPLATE/Improvement.yml

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+name: Improvement
+description: Request or propose an improvement
+title: "[Improvement]: "
+labels: ["Improvement"]
+body:
+    - type: markdown
+      attributes:
+          value: |
+              ## Important notice
+              As an open source project we love to work together with our community to improve and develop our products.
+              It's also important for us to make clear that **we're not working for you or your company**,
+              but we enjoy to work together to improve or add new features to the product.
+              So we are always ready to discuss features and improvements with our community.
+              Especially for bigger topics, please [start a discussion](https://github.com/pimcore/pimcore/discussions) first to aviod unnecessary efforts.
+
+              As soon as a topic is more specific, feel free to create issues for it or even better provide a corresponding PR as we love to
+              review and merge contributions.
+
+              Feature requests that do not meet the conditions listed below will be closed/deleted without comment.
+              - There's no existing ticket for the same topic
+              - This is already a specific ready-to-work-on feature request
+
+    - type: textarea
+      attributes:
+          label: Improvement description
+      validations:
+          required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+    - name: We are hiring!
+      url: https://pimcore.com/en/careers?utm_source=github&utm_medium=issue-template-customer-data-framework&utm_campaign=careers
+      about: Enjoy working with Pimcore? Join us on our mission!
+    - name: Community Support
+      url: https://github.com/pimcore/pimcore/discussions
+      about: Please ask and answer questions here.