add new page for implementing likes

P16-Implementing-Likes/content.md

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+---
+title: "Implementing the Like feature"
+slug: parse-implement-like
+---
+
+In this step we will tackle _the_ core feature of _Makestagram_. Liking posts!
+We will need to tackle that feature from three different angles:
+
+1. We need new Parse queries to fetch/add/remove likes of posts
+2. We need to extend the `Post` model to store the likes that belong to it
+3. We need to connect the UI to our new code. That means, for example, displaying the red heart if a user
+has liked a certain post
+
+We will start with adding new Parse queries! However, I first want to suggest some further cleanup of our existing Parse query!
+
+#Cleaning up the Timeline Query - once again
+
+Take a look at ...