starting nesting

nesting.md

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+# Nesting
+
+## Lesson Objectives
+
+1. Describe nested routes
+1. Create components for two sub sections
+
+## Describe nested routes
+
+Sometimes you want to have sub sections within a specific route (routes within routes).  We can accomplish this with nested routes.
+
+## Create components for two sub sections
+
+We're going to split `/about` into `/about/early-life` and `/about/career`.
+
+Generate the two components: