Adds Lesson 9.4

Author: jarturomora

docs/lectures/lecture-09/lesson-04/README.md

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+# Lesson 9.4: Deploying Stablecoin's Reference Scripts
+
+Welcome to Lesson 9.4! In this lesson, you'll learn how the reference scripts work and how to deploy them before minting stablecoin tokens.
+
+{% embed url="https://youtu.be/AokRj-upwlY" %}
+
+{% tabs %}
+{% tab title="Learning Objectives" %}
+After completing this lesson, you'll be able to:
+
+* Build and deploy the reference scripts required to mint a stablecoin.
+* Describe how the reference scripts work.
+{% endtab %}
+{% endtabs %}
+
+## Collaborate with the Pioneers Community
+
+Remember that you can interact with the participants of the PPP through the [IOG's technical community on Discord](https://discord.gg/inputoutput) by joining the channels under the Plutus Pioneers category.
+
+If during the program you have questions about Plutus, we invite you to share them at [Cardano Stack Exchange (CSE)](https://cardano.stackexchange.com/) by adding the `plutus-pioneer-program` tag to your question. The IOG's Education Team members will monitor these questions to support your learning journey. Whenever you share a question at CSE, you're helping to build up the Cardano and Plutus development knowledge base.
+
+---
+
+This work is licensed under a [Creative Commons Attribution 4.0 International License](http://creativecommons.org/licenses/by/4.0/).
+
+<figure><img src="https://i.creativecommons.org/l/by/4.0/88x31.png" alt="Creative Commons License BY 4.0"></figure>