Updates playbook summary

Author: jarturomora

docs/SUMMARY.md

@@ -52,8 +52,20 @@
 
 * [Lecture 6](lectures/lecture-06/README.md)
   * [Lesson 6.1: The State Monad in Practice](lectures/lecture-06/lesson-01/README.md)
-  * [Lesson 6.2: TIntroduction to the Plutus Simple Model Library](lectures/lecture-06/lesson-02/README.md)
+  * [Lesson 6.2: Introduction to the Plutus Simple Model Library](lectures/lecture-06/lesson-02/README.md)
   * [Lesson 6.3: Unit Testing a Smart Contract](lectures/lecture-06/lesson-03/README.md)
   * [Lesson 6.4: Property Testing a Smart Contract](lectures/lecture-06/lesson-04/README.md)
   * [Lesson 6.5: Testing Smart Contracts with Lucid](lectures/lecture-06/lesson-05/README.md)
-  * [Lecture 6 Homework Assignment](lectures/lecture-06/lesson-06/README.md)
+  * [Lecture 6 Homework Assignment](lectures/lecture-06/lesson-06/README.md)
+
+* [Lecture 7](lectures/lecture-07/README.md)
+  * [Lesson 7.1: Introduction to Marlowe](lectures/lecture-07/lesson-01/README.md)
+  * [Lesson 7.2: Marlowe Playground Demo](lectures/lecture-07/lesson-02/README.md)
+  * [Lecture 7 Homework Assignment](lectures/lecture-07/lesson-03/README.md)
+  * [Lesson 7.3: Marlowe Starter Kit - Docker](lectures/lecture-07/lesson-04/README.md)
+  * [Lesson 7.4: Marlowe Starter Kit Preliminaries](lectures/lecture-07/lesson-05/README.md)
+  * [Lesson 7.5: ZCB using the Marlowe Runtime command-line client](lectures/lecture-07/lesson-06/README.md)
+  * [Lesson 7.6: ZCB using the Marlowe Runtime REST API](lectures/lecture-07/lesson-07/README.md)
+  * [Lesson 7.7: ZCB using the Marlowe Runtime CLI](lectures/lecture-07/lesson-08/README.md)
+  * [Lesson 7.8: Escrow using the Marlowe Runtime's REST API](lectures/lecture-07/lesson-09/README.md)
+  * [Lesson 7.9: Swap contract using the Marlowe Runtime's REST API](lectures/lecture-07/lesson-10/README.md)