Created Adding Game Covers (markdown)

Adding-Game-Covers.md

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+DuckStation's Qt frontend now supports displaying cover images for games in a grid.
+
+<p align="center">
+  <a href="https://raw.githubusercontent.com/stenzek/duckstation/md-images/gamegrid.png"><img src="https://raw.githubusercontent.com/stenzek/duckstation/md-images/gamegrid.png" alt="Game Grid" width="800" /></a>
+</p>
+
+Currently, there is no auto downloading for covers. But you can add them yourself quite easily.
+
+1. Click `Tools -> Open Data Directory`. This will open the user directory, also where memory cards, save states, screenshots, etc are saved.
+2. Navigate to the `covers` subdirectory.
+3. Put your cover images in here. The name of this image should match either:
+  - The title of the game (you can get this from the game list, or properties dialog), assuming you have downloaded the redump db (e.g. `Crash Bandicoot (USA).png`).
+  - The filename of the game (e.g. `crash.png` for `crash.chd`).
+  - The serial of the game (e.g. `SCUS-94900.png`).
+4. After adding cover images, either restart DuckStation, or click `View -> Refresh Covers`.
+
+After adding cover images, you can switch to the game view by selecting `View -> Game Grid`. You can adjust the image size by holding control and scrolling the mouse wheel, or using `CTRL and +` or `CTRL and -`.