添加500star贺图到仓库readme

.github/500stars/README.md

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+# Techmino - 500-star Banner
+Created by NOT_A_ROBOT
+13 September, 2024
+
+**Don't forget to attribute me when using this.**
+The image already includes sufficient attribution, so if you just don't crop that out, you shouldn't need to explicitly mention them.
+
+## Attribution
+Created by NOT_A_ROBOT
+GitHub logo (on Z-character's screen) by GitHub
+Background (space stars) originally by MrZ, ported to JS by NOT_A_ROBOT for rendering
+Block skin (featured in the background) by Scf, slightly modified to make it darker
+Z-character drawn by 葉枭, designed by MrZ
+Techmino by MrZ and many contributors
+
+Techmino is fun! https://github.com/26F-Studio/Techmino