Structured README.md

02_IntroductionToROS/README.md

 # Introduction to ROS
 
+> **Learning objective**:
+>
+> After completion of exercise 1 you should know the ROS components and concepts
+> - Master,
+> - Node,
+> - Message,
+> - Topic,
+> - Service
+>
+> and how the organization of ROS on a filesystem level in packages works using the catkin build system.
+
+## Sections of this Exercise
+
+1. [What is ROS?](#what-is-ros)
+2. [ROS Philosophy](#ros-philosophy)
+3. [ROS Concepts](#ros-concepts)
+    1. [Computation Graph Level](#computation-graph-level)
+    2. [Filesystem Level](#filesystem-level)
+    3. [Community Level](#community-level)
+4. [First Steps with ROS](#first-steps-with-ros)
+    1. [ROS Workspace](#ros-workspace)
+    2. [ROS Master](#ros-master)
+    3. [Nodes](#nodes)
+    4. [Topics](#topics)
+    5. [Services](#services)
+    6. [Messages](#messages)
+    7. [ROS CLI commands](#ros-command-line-interface-commands)
+    8. [Catkin Workspace](#catkin-workspace)
+5. [Building a Package](#building-a-package)
+6. [Implementing a Node](#implementing-a-node)
+
+
+## What is ROS?
+
+
+## ROS Philosophy
+
+
+## ROS Concepts
+
+### Computation Graph Level
+
+### Filesystem Level
+
+### Community Level
+
+
+
+## First Steps with ROS
+
+### ROS Workspace
+
+### ROS Master
+
+### Nodes
+
+### Topics
+
+### Services
+
+### Messages
+
+### ROS command-line interface commands
+
+### Catkin Workspace
+
+
+## Building a Package
+
+## Implementing a Node
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