Add install.md page

Author: fjp

docs/hardware_setup/install.md

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+# Installation
+
+After completing the hardware setup, the next steps that follows consist of
+
+- Preparing the software on the [processing units](../processing_units/index.md)
+- Installing the [ROS software packages](../packages/index.md)
+
+
+If you want to learn more about the theory behind robotics visit [Robotics Theory](../theory/index.md) pages.