Create steamos-user-guide.md

docs/steamos-user-guide.md

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+Decky Loader, Heroic Games Launcher.  Try different Decky plugins.  Explore desktop mode.  Install flatpaks. 
+# Steam Deck Guide
+
+## Primer
+
+* Basic usage: https://help.steampowered.com/en/faqs/view/69E3-14AF-9764-4C28
+* What is Proton?: https://gamerant.com/steam-deck-how-to-use-the-proton-compatibility-features/. Allows you to run non-Linux native games, works super well nowadays.
+* Like Retro gaming? Install EmuDeck: https://www.emudeck.com/
+* Heroic: https://heroicgameslauncher.com/
+* Look for some fun accessories. My favorite is from https://jsaux.com/collections/steam-deck-accessories. 
+
+## Decky Loader stuff
+
+https://plugins.deckbrew.xyz (yes, I have tried them ALL)
+
+* AutoFlatpaks:  allows you to install while in game mode, very convenient.  
+* CSS Loader can be iffy with performance, and I generally avoid it, but fun to play with
+* ProtonDB Badges: must have, easy access to ProtonDB from games that exist in https://steamdb.info/. Helps with tips on running games, performance reports etc..
+* Bluetooth: Very useful for quick access to headsets etc..
+* HLTB for Deck: Good for fun stats on beating the game
+* SteamGridDB: Must have, fill in missing artwork for different areas of the game info pages/views, alternate artwork
+* Volume Mixer: Super nice to keep Steam button noise lower, so games can be full volume
+* Decky Recorder: Record games, but now that non-beta has game recording and sharing features, not as useful
+* Quick Launch: Useful for creating shortcuts from game mode for non-steam games/apps
+* Web Browser: Kinda-sorta-better browser, but still limited like the Steam browser
+* Decky Terminal: If you're a Linux nerd
+* Wine Cellar: SUPER useful for managing Proton/Wine versions (which you'll find you need/want for the non-Linux native games. For the most part Proton Experiemental will work fine
+* Brightness Bar: Visual bar for up/down brigh
+* tness