Updated How to create custom touch control layout (markdown)

How-to-create-custom-touch-control-layout.md

@@ -134,3 +134,42 @@ BX_EXPOSED.test_touch_control(
 )
 ```
 6. Use the [Touch Adaptation Kit documentation](https://learn.microsoft.com/en-us/gaming/gdk/_content/gc/system/overviews/game-streaming/game-streaming-touch-touch-adaptation-kit-overview) to design your own layout. You can also look at [other custom layouts](https://github.com/redphx/better-xcloud/tree/gh-pages/touch-layouts/layouts) for references.
+7. Pass your modified layout to the `BX_EXPOSED.test_touch_control()` function to update it. Do this step again and again until you satisfy with the result.
+
+## Submit layout
+1. Fork the [`gh-pages`](https://github.com/redphx/better-xcloud/tree/gh-pages) branch:
+
+2. Create two files: `<XBOX_TITLE_ID>.json` and `layouts/<LAYOUT_FILE_NAME>.json`  
+- ⚠️ Use [DuckDuckGo's JSON Beautifier tool](https://duckduckgo.com/?t=ffab&q=format+json&ia=answer) (indent with 2 spaces) to beautify & validate the JSON contents first.
+- `<XBOX_TITLE_ID>.json`:
+    - To find the value of `XBOX_TITLE_ID`:
+        1. Find the game on [dbox.tools](https://dbox.tools). [Here](https://dbox.tools/store/products/9PLZPHBNHTMF/) is the page for DOOM 1993.
+        2. Copy the value in `Title ID` row (Doom 1993 = `60A2D9F6`).
+        3. [Convert that value into decimal](https://www.rapidtables.com/convert/number/hex-to-decimal.html) and you get your `XBOX_TITLE_ID` value. For DOOM 1993 it's `1621285366`.
+    - File template:
+```json
+{
+  "name": "GAME NAME",
+  "default_layout": "LAYOUT_ID",
+  "layouts": [
+    "LAYOUT_FILE_NAME"
+  ]
+}
+```
+- `layouts/<GAME>.json`: 
+    - File template:
+```json
+{
+  "schema_version": 1,
+  "layouts": {
+    "LAYOUT_ID": {
+      "name": "Layout Name",
+      "content": {...}
+    }
+  }
+}
+```
+3. Create your pull request including the screenshot of the layout. Chrome/Edge has a built-in screenshot feature:
+<img width="366" alt="Screenshot 2024-03-10 at 10 39 49" src="https://github.com/redphx/better-xcloud/assets/96280/cb6d0211-9f6b-4a37-ae84-f6df5c14d7bf">
+
+That's the basic of  it. I'll update with more details later.