Create release-5.1.md

Author: LennyMcLennington

src/news/release-5.1.md

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+---
+title: (ANOTHER SECURITY VULNERABILITY - READ TO STAY SAFE) PolyMC 5.1, now available
+description: Bug fixes and patch for a security vulnerability.
+date: 2023-02-19
+release_version: 5.1
+minimum_macos_version: 10.14.0
+mac_signature: r0T8ecyH7XTXD+3ZbgcUVRP6vxvoAWD8EqtHz67WqEY1yuDuGQH+q2XsmaSpV/dGsvVKnYJLIsk+VUgXe+iOCA==
+tags:
+  - release
+---
+
+This new version of PolyMC patches a security vulnerability in the software's zip file handling. Don't use the 'import from zip' option on versions of the software older than 5.1.
+
+Other changes are a fix to importing FTB packs, a fix for the modrinth pack list being formatted wrong, and a fix for copying instances on Unix-like systems.
+
+## What's Changed
+* fix(MMCZip): ignore invalid file paths in extractSubDir by @LennyMcLennington in https://github.com/PolyMC/PolyMC/pull/1546
+* fix: handle single files in copy tasks by @Doggermelon in https://github.com/PolyMC/PolyMC/pull/1526
+* fix: Make modrinth text layout not be weird by @LennyMcLennington in https://github.com/PolyMC/PolyMC/pull/1548
+* Clean & Compress Floppas by @KaspianDev in https://github.com/PolyMC/PolyMC/pull/1541
+* Fix instance copy on Linux and macOS by flowln in https://github.com/PolyMC/PolyMC/pull/1552
+
+## New Contributors
+* @Doggermelon made their first contribution in https://github.com/PolyMC/PolyMC/pull/1526
+* @KaspianDev made their first contribution in https://github.com/PolyMC/PolyMC/pull/1541
+
+**Full Changelog**: https://github.com/PolyMC/PolyMC/compare/5.0...5.1
+
+You can [grab the latest download here](/download) for your respective platform.