feat: use templates while creating features and issues (getAlby#611)

feat(github_issue_templates): add issue templates and security policy
signed-off-by: Pavan Joshi <pavanj914@gmail.com>

Co-authored-by: Michael Bumann <hello@michaelbumann.com>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: "🐞 Bug report"
+about: Create a report to help us improve (use this to report bugs only)
+title: ''
+labels: "🐞 bug"
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Visit to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Information About Alby**
+- Alby Version: [e.g. 1.5.0]
+- Alby installed through [e.g. installed through the browser stores, installed manually]
+- Wallet connected with Alby [e.g. LND, BlueWallet LNDhub]
+
+**Screenshots (If Any)**
+Add screenshots to help explain your problem.
+
+**Device Information [optional]:**
+ - OS: [e.g. Windows]
+ - Browser [e.g. chrome, safari, firefox]
+ - Browser Version [e.g. 22]
+
+**Additional context**
+Add any other additional context about the problem here.
+
+**Are you working on this issue? (Yes/No)**

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Have any issues to discuss regarding Alby?
+    url: https://bitcoindesign.slack.com/archives/C02591ADXM2
+    about: Join us on Slack and meet members, contributors and the owners!

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: "✨ Feature request"
+about: Suggest an idea for this project
+title: ''
+labels: "✨ feature"
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is.
+
+**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 additional context or screenshots about the feature request here.
+
+**Are you working on this? (Yes/No)**

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+See releases section for versions of Alby that are currently being supported with 
+security updates: https://github.com/getAlby/lightning-browser-extension/releases
+
+## Reporting a Vulnerability
+
+If you found a security vulnerability on this platform please send an email to security@getalby.com (do not use this email for asking any kind of support).
+
+The following key may be used to communicate sensitive information to Alby developers:
+
+| Name | PGP Fingerprint |
+|------|-------------|
+| Michael Bumann | 163A 86B4 B913 FF60 A84E  2AB8 FFE0 5711 E1D0 A2B0 |
+| security@getalby.com | B4A4 1AFC 9A15 0CCE A409  0D78 948A 7A9B 1B51 CDAE |
+
+We also accept vulnerability reports through https://huntr.dev platform.
+
+You can also communicate with us on [Slack](https://bitcoindesign.slack.com/archives/C02591ADXM2) channel.