Add SNK (#2442)

* SNK游戏公司

snk-corp.co.jp 官网域名
snkplaymore.info steam网战时会连接的域名

* Update category-games to include SNK

* Rename snk.txt to snk

data/category-games

@@ -25,6 +25,7 @@ include:projectsekai
 include:purikonejp
 include:riot
 include:rockstar
+include:snk
 include:steam
 include:steamunlocked
 include:tencent-games

data/snk

@@ -0,0 +1,2 @@
+snk-corp.co.jp
+snkplaymore.info