Add info about CustomizationContext to the docs

src/customizationContext/CustomizationContext.md

@@ -0,0 +1,3 @@
+It provides customization context to the children. `CustomizationContext` allows
+using `useCustomizationContext` in components to check if the reForis UI is
+customized or not for specific devices.

styleguide.config.js

@@ -51,6 +51,12 @@ module.exports = {
             sectionDepth: 1,
         },
 
+        {
+            name: "Customization Context",
+            components: ["src/customizationContext/CustomizationContext.js"],
+            exampleMode: "expand",
+            usageMode: "expand",
+        },
         {
             name: "Bootstrap components",
             description: "Set of bootstrap components.",