docs(switch): add switch-install player guide

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/switch-install.md

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+# Install Gen1Recomp on Nintendo Switch
+
+Every GitHub Release that includes Switch support ships a fused homebrew
+binary: `gen1recomp-*-switch.nro`. Copy it to your microSD, launch with
+**title override**, then import your own legal `.gb` ROM.
+
+> **Experimental.** The Switch port is still WIP (issue
+> [#531](https://github.com/bryanthaboi/gen1recomp/issues/531)). Hardware
+> evidence so far is **Switch OLED only** — other models are untested.
+> You need a console that can run Switch homebrew (custom firmware / hbmenu).
+> This project does not help you set that up.
+
+Prefer building from source? See [switch-build.md](switch-build.md).
+
+## 1. Download the NRO
+
+1. Open
+   [Releases](https://github.com/bryanthaboi/gen1recomp/releases).
+2. Download `gen1recomp-*-switch.nro` for the version you want.
+   (Optional: the matching `*.nro.sha256` sidecar if you want to verify the
+   download.)
+
+## 2. Copy it to the microSD
+
+Put the file here on the SD card:
+
+```text
+sdmc:/switch/gen1recomp/gen1recomp.nro
+```
+
+(or keep the versioned name under `sdmc:/switch/gen1recomp/` — hbmenu will
+list it either way).
+
+Any method that lands the file on the SD is fine: **DBI → Run MTP responder**
+plus an MTP client, Hekate UMS, a card reader, etc. Exit MTP / unmount cleanly
+before launching.
+
+## 3. Launch with title override
+
+**Applet Mode is not supported** for this game (not enough memory).
+
+1. On the Switch HOME menu, highlight any installed title.
+2. Hold **R** and launch that title — this opens hbmenu with full memory
+   (title override).
+3. From hbmenu, open `gen1recomp`.
+
+Do **not** launch from the Album applet path for normal play.
+
+## 4. Import your ROM
+
+This project ships **no** game data. On first launch:
+
+1. Put your own legally obtained Pokémon Red or Blue `.gb` into the ROM
+   inbox under the game’s save directory (`imports/` — the launcher shows
+   the live path).
+2. Use **Procurar novamente** / rescan on the Red/Blue tab if you add the
+   file after the first open.
+
+Saves live in the LÖVE save directory and **persist across NRO updates** —
+you can replace only the `.nro` and keep your progress.
+
+## Prefer building it yourself?
+
+Building the fused (or loose) NRO from source is covered in
+[switch-build.md](switch-build.md). Hardware evidence and contributor MTP
+loops: [switch-development.md](switch-development.md).