Add Hypersomnia entry

entries/hypersomnia.md

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+# Hypersomnia
+
+- Home: https://hypersomnia.xyz/
+- Inspiration: Hotline Miami, Counter-Strike
+- State: mature
+- Download: https://hypersomnia.xyz/
+- Platform: Windows, Linux, macOS
+- Keyword: action, top-down, shooter, pixelart
+- Code repository: https://github.com/TeamHypersomnia/Hypersomnia
+- Code language: C++
+- Code license: AGPL-3.0
+- Developer: Patryk Czachurski
+
+Adrenaline-packed shooter that brings competitive gaming to the open-source community. Completely free without hidden payments.
+
+## Building
+
+- Build system: CMake
+- Build instruction: Refer to [repository's README.](https://github.com/TeamHypersomnia/Hypersomnia#how-to-build)