added aosp tree source

introduction.md

@@ -5,7 +5,7 @@ If you came to learn about AOSP then you’re in exactly the right place to star
 Let’s start by building a foundational Knowledge about AOSP
 
 
-### 📦 What is AOSP?
+### What is AOSP?
 
 The **Android Open Source Project (AOSP)** is the official open-source codebase of Android maintained by Google. It includes all the components that power Android devices — from the low-level kernel, up to the system apps and libraries.
 
@@ -17,15 +17,14 @@ It's split into layers, kind of like a cake:
 5. **Framework Layer** – High-level APIs that app developers use.
 6. **System Apps** – Phone, Contacts, Settings, etc.
 
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-### 🧰 Tools You'll Eventually Use
+### Tools You'll Eventually Use
 
 - `repo` – For syncing and managing Android source.
 - `lunch`, `make` – To configure and build the OS.
 - `adb` – To talk to Android devices.
 - `fastboot` – For flashing firmware.
 - Theres is much more, you will get to know about it later in this guide.
----
+
 
 I will explain each part step-by-step as i learned. Sit back tight. Lets Jump into AOSP Source Tree Structure.