docs(security): init

SECURITY.md

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+<p align="center">
+  <picture>
+    <source
+      width="256px"
+      media="(prefers-color-scheme: dark)"
+      srcset="assets/revanced-headline/revanced-headline-vertical-dark.svg"
+    >
+    <img 
+      width="256px"
+      src="assets/revanced-headline/revanced-headline-vertical-light.svg"
+    >
+  </picture>
+  <br>
+  <a href="https://revanced.app/">
+       <picture>
+           <source height="24px" media="(prefers-color-scheme: dark)" srcset="assets/revanced-logo/revanced-logo-round.svg" />
+           <img height="24px" src="assets/revanced-logo/revanced-logo-round.svg" />
+       </picture>
+   </a>&nbsp;&nbsp;&nbsp;
+   <a href="https://github.com/ReVanced">
+       <picture>
+           <source height="24px" media="(prefers-color-scheme: dark)" srcset="https://i.ibb.co/dMMmCrW/Git-Hub-Mark.png" />
+           <img height="24px" src="https://i.ibb.co/9wV3HGF/Git-Hub-Mark-Light.png" />
+       </picture>
+   </a>&nbsp;&nbsp;&nbsp;
+   <a href="http://revanced.app/discord">
+       <picture>
+           <source height="24px" media="(prefers-color-scheme: dark)" srcset="https://user-images.githubusercontent.com/13122796/178032563-d4e084b7-244e-4358-af50-26bde6dd4996.png" />
+           <img height="24px" src="https://user-images.githubusercontent.com/13122796/178032563-d4e084b7-244e-4358-af50-26bde6dd4996.png" />
+       </picture>
+   </a>&nbsp;&nbsp;&nbsp;
+   <a href="https://reddit.com/r/revancedapp">
+       <picture>
+           <source height="24px" media="(prefers-color-scheme: dark)" srcset="https://user-images.githubusercontent.com/13122796/178032351-9d9d5619-8ef7-470a-9eec-2744ece54553.png" />
+           <img height="24px" src="https://user-images.githubusercontent.com/13122796/178032351-9d9d5619-8ef7-470a-9eec-2744ece54553.png" />
+       </picture>
+   </a>&nbsp;&nbsp;&nbsp;
+   <a href="https://t.me/app_revanced">
+      <picture>
+         <source height="24px" media="(prefers-color-scheme: dark)" srcset="https://user-images.githubusercontent.com/13122796/178032213-faf25ab8-0bc3-4a94-a730-b524c96df124.png" />
+         <img height="24px" src="https://user-images.githubusercontent.com/13122796/178032213-faf25ab8-0bc3-4a94-a730-b524c96df124.png" />
+      </picture>
+   </a>&nbsp;&nbsp;&nbsp;
+   <a href="https://x.com/revancedapp">
+      <picture>
+         <source media="(prefers-color-scheme: dark)" srcset="https://user-images.githubusercontent.com/93124920/270180600-7c1b38bf-889b-4d68-bd5e-b9d86f91421a.png">
+         <img height="24px" src="https://user-images.githubusercontent.com/93124920/270108715-d80743fa-b330-4809-b1e6-79fbdc60d09c.png" />
+      </picture>
+   </a>&nbsp;&nbsp;&nbsp;
+   <a href="https://www.youtube.com/@ReVanced">
+      <picture>
+         <source height="24px" media="(prefers-color-scheme: dark)" srcset="https://user-images.githubusercontent.com/13122796/178032714-c51c7492-0666-44ac-99c2-f003a695ab50.png" />
+         <img height="24px" src="https://user-images.githubusercontent.com/13122796/178032714-c51c7492-0666-44ac-99c2-f003a695ab50.png" />
+     </picture>
+   </a>
+   <br>
+   <br>
+   Continuing the legacy of Vanced
+</p>
+
+# 🔒 Security Policy
+
+This document describes how to report security vulnerabilities for ReVanced Manager.
+
+## 🚨 Reporting a Vulnerability
+
+Please open an issue in our [advisory tracker](https://github.com/ReVanced/revanced-manager/security/advisories/new) or reach out privately to us on [Discord](https://discord.gg/revanced).
+
+If a vulnerability is confirmed and accepted, you can join our [Discord](https://discord.gg/revanced) server to receive a special contributor role.
+
+### ⏳ Supported Versions
+
+| Version | Branch      | Supported          |
+| ------- | ------------|------------------- |
+| v1.18.0 | main        | :white_check_mark: |
+| latest  | dev         | :white_check_mark: |
+| latest  | compose-dev | :white_check_mark: |
+