Adding first two days lecture/lab videos

Author: EcZachly

bootcamp/introduction.md

@@ -4,6 +4,10 @@ This will be six weeks of curricula
 
 - Dimensional Data Modeling
   - Homework is [here](materials/1-dimensional-data-modeling/homework/homework.md)
+  - Day 1 Lecture is [here](https://www.dataexpert.io/lesson/dimensional-data-modeling-lecture-day-1-yt)
+  - Day 1 Lab is [here](https://www.dataexpert.io/lesson/dimensional-data-modeling-lab-day-1-yt)
+  - Day 2 Lecture is [here](https://www.dataexpert.io/lesson/dimensional-data-modeling-day-2-lecture-yt)
+  - Day 2 Lab is [here](https://www.dataexpert.io/lesson/dimensional-data-modeling-day-2-lab-yt)
 - Fact Data Modeling
   - Homework is (to be added)
 - Data Quality (analytics)