Add details on mobile app

docs/app/barcode.md

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+---
+title: App Barcode Support
+---
+
+## Barcode Support
+
+One of the key elements of functionality provided by the InvenTree app is the native support for context-sensitive barcode scanning.
+
+Barcode integration allows extremely efficient stock control, for information lookup and also performing various actions.
+
+### Supported Codes
+
+The following code types are known to be supported
+
+**1D Codes**
+
+- Code-39
+- Code-93
+- Code-128
+- ITF
+
+**2D Codes**
+
+- QR Code
+- Data Matrix
+- Aztec
+
+## Actions
+
+!!! todo "TODO"
+    This section requires further work