chore: Add SPDX header to .github

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

.github/CONTRIBUTING.md

@@ -1,3 +1,7 @@
+<!--
+ - SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
+ - SPDX-License-Identifier: AGPL-3.0-or-later
+-->
 ## Submitting issues
 
 If you have questions about how to install or use Nextcloud, please direct these to our [forum][forum]. We are also available on [IRC][irc].

.github/FUNDING.yml

@@ -1 +1,3 @@
+# SPDX-FileCopyrightText: 2019 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: AGPL-3.0-or-later
 custom: https://nextcloud.com/include/

.github/ISSUE_TEMPLATE/BUG_REPORT.yml

@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: AGPL-3.0-or-later
 name: "🐛 Bug report: Nextcloud Server"
 description: "Submit a report and help us improve Nextcloud Server"
 title: "[Bug]: "

.github/ISSUE_TEMPLATE/Feature_request.md.license

@@ -0,0 +1,2 @@
+SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
+SPDX-License-Identifier: AGPL-3.0-or-later

.github/ISSUE_TEMPLATE/config.yml

@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: AGPL-3.0-or-later
 contact_links:
     - name: 🚨 Report a security or privacy issue
       url: https://hackerone.com/nextcloud

.github/config.yml

@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: AGPL-3.0-or-later
 firstPRMergeComment: >
     Thanks for your first pull request and welcome to the community!
     Feel free to keep them coming! If you are looking for issues to tackle then have a look at this selection: https://github.com/nextcloud/server/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

.github/dependabot.yml

@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: AGPL-3.0-or-later
 version: 2
 updates:
 # Linting and coding style

.github/pull_request_template.md.license

@@ -0,0 +1,23 @@
+<!--
+  - 🚨 SECURITY INFO
+  -
+  - Before sending a pull request that fixes a security issue please report it via our HackerOne page (https://hackerone.com/nextcloud) following our security policy (https://nextcloud.com/security/). This allows us to coordinate the fix and release without potentially exposing all Nextcloud servers and users in the meantime.
+-->
+
+* Resolves: # <!-- related github issue -->
+
+## Summary
+
+
+## TODO
+
+- [ ] ...
+
+## Checklist
+
+- Code is [properly formatted](https://docs.nextcloud.com/server/latest/developer_manual/digging_deeper/continuous_integration.html#linting)
+- [Sign-off message](https://github.com/src-d/guide/blob/master/developer-community/fix-DCO.md) is added to all commits
+- [ ] Tests ([unit](https://docs.nextcloud.com/server/latest/developer_manual/app_development/tutorial.html#unit-tests), [integration](https://docs.nextcloud.com/server/latest/developer_manual/app_development/tutorial.html#integration-tests), api and/or acceptance) are included
+- [ ] Screenshots before/after for front-end changes
+- [ ] Documentation ([manuals](https://github.com/nextcloud/documentation/) or wiki) has been updated or is not required
+- [ ] [Backports requested](https://github.com/nextcloud/backportbot/#usage) where applicable (ex: critical bugfixes)