spice up the readme

Signed-off-by: Benedek Kupper <kupper.benedek@gmail.com>

Author: benedekkupper

README.md

@@ -13,7 +13,7 @@ accurate abstractions, encapsulation, type safety, polymorphism.
 
 * USB 2.0(.1) specification compliant full and high-speed stack
 * self-describing objects -> no manual implementation of any USB descriptors
-* efficient RAM usage
+* easily swappable device configurations
 
 ### Platforms
 
@@ -23,26 +23,27 @@ The library integrates as a **west module** into the following platforms:
 
 ### Device classes
 
-#### HID - Human Interface Device Class
+#### ⌨️ HID - Human Interface Device Class
 
 HID specification version 1.11 is fully supported, with extensive report descriptor tooling
 via [hid-rp][hid-rp] library.
+
 HID has outgrown itself from a pure USB class to a transport-independent protocol,
 and so this library also provides alternative transports for HID applications,
 which interact with the same high-level application API.
 The additional transport layers supported are:
-* BLE (HID over GATT Protocol)
+* BLE (HID over GATT Protocol) - Zephyr backend
 * I2C
 
-#### CDC-ACM - Serial Port
+#### 🔌 CDC-ACM - Serial Port
 
 The Abstract Control Model of Communications Device Class is fully implemented.
 Notably the notification endpoint can be marked as unused, skipping any hardware resource allocation,
 but keeping compatibility with all hosts.
 
 ### Vendor extensions
 
-#### Microsoft OS descriptors
+#### 🪟 Microsoft OS descriptors and alternate enumeration
 
 Microsoft OS descriptors version 2.0 is supported.
 The main motivation to support this functionality is because
@@ -54,7 +55,11 @@ or no driver at all.
 The only possible solution to deal with these is using [Windows Compatible IDs][WCID].
 This is stored in the USB device's descriptors, and tells Windows which driver to load for the given USB function.
 
-#### Microsoft XBOX-360 controller interface
+An even more advanced option is the possibility to define alternate configuration for Windows specifically.
+When Windows enumerates the device, it detects this feature, and sets the device in alternate enumeration mode, allowing the device to define completely different configuration as for all other hosts.
+This allows working around Windows compatibility issues without affecting compliant hosts.
+
+#### 🎮 Microsoft XBOX-360 controller interface
 
 Microsoft XBOX-360 gamepad controller interface is implemented to leverage XInput driver on Windows
 for gamepad applications without any user step. Combining this with Microsoft OS descriptors