Create SECURITY.md

Author: DimensionalSpace

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported |
+
+| ------- | ------------------ |
+
+| 1.0+ | :white_check_mark: |
+| <0.9 | :x: |
+## Reporting a Vulnerability
+
+If a vulnerability has been found:
+
+1. Go to the issues tab: https://github.com/LibreSprite/Dotto/issues
+
+2. Write a full description of the problem
+
+3. Add some screenshots and write your operating system version and device specifications
+
+If there wasn't a response from the developers for a long period of time, you can go to the following links:
+
+https://discord.com/invite/95gbyU5
+
+https://www.reddit.com/r/LibreSprite/