Update index.md

Codemikemike me adding headers to index.md for Markdown activity

Author: codemikemike

index.md

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+# Codemikemike Markdown Learning Journey
+
+## Step 1: Headers
+
+I’m learning how to use Markdown on GitHub!
+
+### Smaller Header
+
+- Bullet points
+- Are coming soon!
+
+
+Added headers to index.md for Markdown activity