emulators: added n64, ps2 and snes emulators

wiki/games/emulators/pcsx2.md

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+# PCSX2
+
+[PCSX2](https://pcsx2.net/) is a PlayStation 2 [emulator](/wiki/games/emulators.md).
+
+## Setup
+
+PCSX2 can be installed on different systems, a list for this can be found on
+the [PCSX2 website](https://pcsx2.net/downloads).
+Additionally it can be installed using [Flatpak](/wiki/linux/flatpak.md) where the
+package is called `net.pcsx2.PCSX2`.

wiki/games/emulators/ppsspp.md

@@ -1,7 +1,6 @@
 # PPSSPP
 
-[PPSSPP](https://ppsspp.org/) is a Playstation Portable (PSP)
-[emulator](/wiki/games/emulators.md).
+[PPSSPP](https://ppsspp.org/) is a PlayStation Portable [emulator](/wiki/games/emulators.md).
 
 ## Setup
 

wiki/games/emulators/simple64.md

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+# simple64
+
+[simple64](https://simple64.github.io/) is a Nintendo 64 [emulator](/wiki/games/emulators.md).
+
+## Setup
+
+simple64 can be installed on different systems, a list for this can be found on
+the [simple64 website](https://simple64.github.io/).
+Additionally it can be installed using [Flatpak](/wiki/linux/flatpak.md) where the
+package is called `https://flathub.org/apps/io.github.simple64.simple64`.

wiki/games/emulators/snes9x.md

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+# Snes9x
+
+[Snes9x](http://www.snes9x.com/) is a Super Nintendo Entertainment System
+[emulator](/wiki/games/emulators.md).
+
+## Setup
+
+Snes9x can be installed on different systems, a list for this can be found on
+the [Snes9x website](http://www.snes9x.com/).
+Additionally it can be installed using [Flatpak](/wiki/linux/flatpak.md) where the
+package is called `com.snes9x.Snes9x`.