Add Switch readme

Packaging/switch/README.txt

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+# Nintendo Switch Port of DevilutionX (Diablo)
+
+# How To Install:
+ - Put `devilutionx.nro` and `CharisSILB.ttf` in into `/switch/devilutionx`
+ - Copy diabdat.mpq from your CD (or GoG install folder) to `/switch/devilutionx`. Make sure it is all lowercase.
+ - Launch `devilutionx.nro`. (Do not use album to launch; see the note below.)
+ - *Note:* Hold R on any installed game and launch it. Do not use album to launch. If you use album, the homebrew will only have a small amount memory available, and the touch keyboard won't work. This is true for all homebrew, not just DevilutionX.
+
+# Joycon Controls
+- Left analog or D-Pad: move hero
+- A: attack nearby enemies, talk to townspeople and merchants, pickup/place items in the inventory, OK while in main menu
+- B: select spell, back while in menus
+- X: pickup items, open nearby chests and doors, use item in the inventory
+- Y: cast spell, delete character while in main menu
+- L: use health item from belt
+- R: use mana potion from belt
+- ZL: character sheet (alt: Start + L1 or ←)
+- ZR: inventory (alt: Start + L2 or →)
+- Left analog click: toggle automap (alt: Start + ↓)
+- Start + Select: game menu (alt: Start + ↑)
+- Select + A/B/X/Y: Spell hotkeys
+- Right analog: move automap or simulate mouse
+- Right analog click or Select + L: left mouse click
+- Select + Right analog click: right mouse click (alt: Select + R1)
+- Select + L2: quest log (alt: Start + Y)
+- Select + R2: spell book (alt: Start + B)
+
+# Touch Controls
+ - Single finger drag: move the mouse pointer (pointer jumps to finger)
+ - Single short tap: left mouse click
+ - Single short tap while holding a second finger down: right mouse click
+ - Dual finger drag: drag'n'drop (left mouse button is held down)
+ - Three finger drag: drag'n'drop (right mouse button is held down)
+
+# Credits
+ - See list of contributors https://github.com/diasurgical/devilutionX/graphs/contributors
+
+# Legal
+DevilutionX is released to the Public Domain. The documentation and functionality provided by DevilutionX may only be utilized with assets provided by ownership of Diablo.
+
+The source code in this repository is for non-commerical use only. If you use the source code you may not charge others for access to it or any derivative work thereof.
+
+Diablo® - Copyright © 1996 Blizzard Entertainment, Inc. All rights reserved. Diablo and Blizzard Entertainment are trademarks or registered trademarks of Blizzard Entertainment, Inc. in the U.S. and/or other countries.
+
+DevilutionX and any of its maintainers are in no way associated with or endorsed by Blizzard Entertainment®.