game entry file names changed to canonical version

games/rocksndiamonds.md

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+# Rocks'n'Diamonds
+
+_Arcade style game for “Boulder Dash” (C 64), “Emerald Mine” (Amiga), “Supaplex” (Amiga/PC), “Sokoban” (PC)_
+
+- Home: http://www.artsoft.org/rocksndiamonds/
+- State: mature
+- Download: http://www.artsoft.org/rocksndiamonds/download/
+- Keywords: action
+- Code repository: http://git.artsoft.org/rocksndiamonds.git
+- Code language: C
+- Code license: GPL-2.0
+
+## Building
+