Add readme to Packaging/ctr.

Packaging/ctr/README.txt

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+# DevilutionX (Diablo 1) for Nintendo 3DS
+*New3DS only
+
+## Installation
+
+<details><summary>.3dsx installation</summary>
+
+#### Install DevilutionX: Diablo
+1. Download [devilutionx.3dsx](https://github.com/MrHuu/devilutionX-3ds/releases/latest/download/devilutionx.3dsx).
+2. Put `devilutionx.3dsx` into `sd:/3ds/devilutionx/`.
+3. Copy `diabdat.mpq` from your Diablo CD (or GoG install folder) to `sd:/3ds/devilutionx/`.
+
+#### Install DevilutionX: Diablo - Hellfire
+4. Copy `hellfire.mpq` `hfmonk.mpq` `hfmusic.mpq` and `hfvoice.mpq` from your Hellfire CD (or GoG install folder) to `sd:/3ds/devilutionx/`.
+
+*Note:* When Hellfire is install you can still launch regular Diablo by passing `--diablo` to `devilutionx.3dsx`.
+
+</details>
+<details><summary>.cia installation</summary>
+
+#### Install DevilutionX: Diablo
+1. Download [devilutionx.cia](https://github.com/MrHuu/devilutionX-3ds/releases/latest/download/devilutionx.cia).
+2. Put `devilutionx.cia` on your SD card and install with a title manager, e.g. [FBI](https://github.com/Steveice10/FBI).
+	`devilutionx.cia` can be removed after being installed.
+3. Copy `diabdat.mpq` from your Diablo CD (or GoG install folder) to `sd:/3ds/devilutionx/`.
+
+##### Install DevilutionX: Diablo - Hellfire
+4. Copy `hellfire.mpq` `hfmonk.mpq` `hfmusic.mpq` and `hfvoice.mpq` from your Hellfire CD (or GoG install folder) to `sd:/3ds/devilutionx/`.
+</details>
+
+## Usage
+
+When using .3dsx:
+
+- Launch `devilutionx.3dsx` with the [Homebrew Launcher](https://github.com/fincs/new-hbmenu).
+
+or, when using .cia:
+
+- Launch Diablo from your 3DS Homemenu.
+
+## Controls
+
+- Circle-Pad 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
+- Start + ↑: game menu (alt: Start + Select)
+- Start + ↓: toggle automap
+- Start + ←: character sheet (alt: ZL or Start + L)
+- Start + →: inventory (alt: ZR or Start + R)
+- Start + X: toggle zoom
+- Select + D-Pad: move automap or simulate mouse
+- Select + A/B/X/Y: Spell hotkeys
+- Select + ZL: quest log (alt: Start + Y)
+- Select + ZR: spell book (alt: Start + B)
+
+## Touchpad
+
+- Single finger drag: move the mouse pointer (pointer jumps to finger)
+- Single short tap: left mouse click
+
+## Resources
+
+* Discord: https://discord.gg/aQBQdDe
+* GitHub: https://github.com/diasurgical/devilutionX