Update README.md

Author: rogermarte

README.md

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-# workshop-3
-Recycler view implementation
+# Overview
+The intention of this workshop is to go through some basic aspects of implement recycler views.
+- Create object model
+- Add recycler view in layout
+- Add custom row layout
+- Create recycler view adapter
+- Binding the adapter to the recycler view
+- Notifying the adapter
+- Animations
+
+# Companion slides
+[Here!](slides/workshop3.pdf) 😃
+
+# Step by Step
+Every commit in the repo is an small individual step. You can check out the list of [commits](https://github.com/schibsted-android-training/workshop-3/commits/master) to view the detailed process step by step.