Added "Block Attack - Rise of the Blocks"

games/puzzle/blockattack.md

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+# Block Attack - Rise of the Blocks
+
+_A match-3 game inspired by "Tetris Attack" but more PC friendly_
+
+- Home: https://blockattack.net
+- State: mature
+- Download: https://blockattack.net/download/
+- Platform: Windows, Linux
+- Keywords: tetris attack, sliding blocks, match 3
+- Code repository: https://github.com/blockattack/blockattack-game.git
+- Code language: C++
+- Code license: GPLv2 or later
+- Code dependencies: C++11 compiler, SDL2, SDL2_image, SDL2_mixer, SDL2_ttf, physfs, boost, boost-program-options, utfcpp, gettext
+- Assets license: GPLv2, GPLv2 or later, CC-BY-SA, Public Domain
+
+First version released to the public was version 1.0.5 released May 6th, 2005.
+Game play have been relatively stable since version 1.1.0 released June 13th, 2005.
+Moved from SDL1 to SDL2 with version 2.0.0 released May 1st, 2016.
+Used to have basic network functionality prior to 2.0.0.
+
+## Building
+
+- Build system: CMake
+- Build instructions: ./packdata && CMake . && make