moved the entries up one folder, added the folder to the keywords

games/chromium_bsu.md

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+# Chromium B.S.U.
+
+_Arcade-style, top-scrolling space shooter._
+
+- Home: http://chromium-bsu.sourceforge.net/, https://sourceforge.net/projects/chromium-bsu/
+- Media: https://en.wikipedia.org/wiki/Chromium_B.S.U.
+- State: mature,
+- Download: http://chromium-bsu.sourceforge.net/download.html, https://sourceforge.net/projects/chromium-bsu/files/
+- Keywords: action, shooter, top-down
+- Code repository: https://git.code.sf.net/p/chromium-bsu/code
+- Code language: C++
+- Code license: Artistic License
+
+## Building
+
+- Build system: Autoconf