Issue templates, security info and no-response

Signed-off-by: Joas Schilling <coding@schilljs.com>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 0. Needs triage, bug
+assignees: ''
+
+---
+
+## Steps to reproduce
+1.
+2.
+3.
+
+### Expected behaviour
+Tell us what should happen
+
+### Actual behaviour
+Tell us what happens instead
+
+
+## Device information
+
+**Device:** Fairphone2/…
+
+**Android version:** 10/…
+
+**Talk version:** 11.0.0
+
+## Server information
+
+**Nextcloud version:** (see admin overview page: `/index.php/settings/admin/overview`)
+
+**Talk version:** (see apps admin page: `/index.php/settings/apps`)
+
+**Custom Signaling server configured:** yes/no and version (see talk admin settings: `/index.php/index.php/settings/admin/talk#signaling_server`)
+
+**Custom TURN server configured:** yes/no (see talk admin settings: `/index.php/settings/admin/talk#turn_server`)
+
+**Custom STUN server configured:** yes/no (see talk admin settings: `/index.php/settings/admin/talk#stun_server`)
+
+### Server log (data/nextcloud.log)
+<details>
+
+```
+Insert your server log here
+```
+</details>

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for Nextcloud Talk Android
+title: ''
+labels: 0. Needs triage, enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/no-response.yml

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+# Configuration for probot-no-response - https://github.com/probot/no-response
+
+# Number of days of inactivity before an Issue is closed for lack of response
+daysUntilClose: 21
+# Label requiring a response
+responseRequiredLabel: "needs info"
+# Comment to post when closing an Issue for lack of response. Set to `false` to disable
+closeComment: >
+  This issue has been automatically closed because there has been no response
+  to our request for more information. With only the information that is
+  currently in the issue, we don't have enough information to take action.
+  Please reach out if you have or find the answers we need so that we can
+  investigate further.

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Only the latest major release version of Nextcloud Talk Android is currently being supported with security updates.
+
+## Reporting a Vulnerability
+
+Security is very important to us. If you have discovered a security issue with Nextcloud,
+please read our responsible disclosure guidelines and contact us at [hackerone.com/nextcloud](https://hackerone.com/nextcloud).
+Your report should include:
+
+- Product version
+- A vulnerability description
+- Reproduction steps
+
+A member of the security team will confirm the vulnerability, determine its impact, and develop a fix.
+The fix will be applied to the master branch, tested, and packaged in the next security release.
+The vulnerability will be publicly announced after the release. Finally, your name will be added
+to the [hall of fame](https://hackerone.com/nextcloud/thanks) as a thank you from the entire Nextcloud community. Note our 
+[threat model](https://nextcloud.com/security/threat-model) to know what is expected behavior.
+
+
+Please visit https://nextcloud.com/security/ for further information about security.