#93 colors usage added in readme

Author: Alex009

README.md

@@ -17,6 +17,7 @@ This is a Kotlin MultiPlatform library that provides access to the resources on
 
 ## Features
 - **Strings, Plurals, Images, Fonts, Files** to access the corresponding resources from common code;
+- **Colors** with light/dark mode support;
 - **StringDesc** for lifecycle-aware access to resources and unified localization on both platforms;
 - **FatFrameworkWithResourcesTask** Gradle task.
 
@@ -375,6 +376,65 @@ We got autogenerated `MR.fonts.Raleway.italic`, `MR.fonts.Raleway.regular`, `MR.
 - Android: `textView.typeface = font.getTypeface(context = this)`
 - iOS: `textView.font = font.uiFont(withSize: 14.0)`
 
+### Example 9 - pass colors
+Colors resources directory is `commonMain/resources/MR/colors`.  
+Colors files is `xml` with format:
+```xml
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="valueColor">#B02743FF</color>
+    <color name="referenceColor">@color/valueColor</color>
+    <color name="themedColor">
+        <light>0xB92743FF</light>
+        <dark>7CCFEEFF</dark>
+    </color>
+    <color name="themedReferenceColor">
+        <light>@color/valueColor</light>
+        <dark>@color/referenceColor</dark>
+    </color>
+</resources>
+```
+If you want use one color without light/dark theme selection:
+```xml
+<color name="valueColor">#B02743FF</color>
+```
+If you want use value of other color - use references:
+```xml
+<color name="referenceColor">@color/valueColor</color>
+```
+If you want different colors in light/dark themes:
+```xml
+<color name="themedColor">
+    <light>0xB92743FF</light>
+    <dark>7CCFEEFF</dark>
+</color>
+```
+Also themed colors can be referenced too:
+```xml
+<color name="themedReferenceColor">
+    <light>@color/valueColor</light>
+    <dark>@color/referenceColor</dark>
+</color>
+```
+
+Colors available in common code insode `MR.colors.**` as `ColorResource`.  
+`ColorResource` can be `ColorResource.Single` - simple color without theme selection.  
+And can be `ColorResource.Themed` with colors for each mode.
+
+You can read colors value from common code:
+```kotlin
+val color: Color = MR.colors.valueColor.color
+```
+but if you use `ColorResource.Themed` you can get current theme color only from platfrom side.
+Android:
+```kotlin
+val color: Color = MR.colors.valueColor.getColor(context = this)
+```
+iOS:
+```swift
+val color: UIColor = MR.colors.valueColor.getColor(UIScreen.main.traitCollection.userInterfaceStyle)
+```
+
 ### Gradle task for creating Fat Framework with resources 
 
 If you want to create Fat Framework for iOS with all resources from KMP Gradle module you should use