Add the description for the first task of the tutorial

docs/tasks/1_implement_behavior_component.md

@@ -1,10 +1,43 @@
 ---
 title: "Task 1: Implement a Behavior Component"
-description: Implement your first getCommand function, such that the ChaseGhost behavior component passes its unit tests.
+description: Implement your first checkInvocationCondition and getCommand function, such that the ChaseGhost behavior component passes its unit tests.
 ---
 
 # Chase Ghost
 
+## Context
+
+Before we start building our arbitration graph, we want to take a closer look into behavior components.
+Don't worry, most of the behavior components are already implemented for you
+  but we want to make sure you have an idea of how they work.
+
+With the current state of the arbitration graph, PacMan will just move around randomly until a ghost gets too close.
+That's great and all but if we ate a power pellet, we want to chase the ghosts to eat them for extra points.
+
+To do this, we need to implement the `ChaseGhost` behavior component.
+It essentially does the exact opposite of the `AvoidGhost` behavior component
+  but is only applicable when PacMan ate a power pellet.
+We can ensure that's always the case using the behavior's invocation condition.
+
+But wait - the current implementation of the invocation condition is not complete.
+It should only be applicable if there is one of these tasty ghosts close by.
+
+Once that's out of the way, we'll take a closer look at the `getCommand` function which is missing some core logic right now.
+
+## Goal
+
+Finish the implementation of the `checkInvocationCondition` and `getCommand` functions
+  of the `ChaseGhost` behavior component such that it passes its unit tests.
+
+## Instructions
+
+- Open the implementation of the `ChaseGhost` behavior component in `src/chase_ghost_behavior.cpp`.
+- The `checkInvocationCondition` function is already implemented but does not check for the presence of a ghost.
+- Implement the missing piece. Take a look at the implementation of `AvoidGhostBehavior::checkInvocationCondition` if you need inspiration.
+- The `getCommand` function is partially implemented but the core logic is missing.
+- Implement the missing piece. Take a look at the implementation of `AvoidGhostBehavior::getCommand` if you need inspiration.
+- Compile and run the unit tests for the `ChaseGhost` behavior component to verify that your implementation is correct.
+
 
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