add instructions to readme

Author: leocaseiro

readme.md

@@ -2,12 +2,40 @@
 
 An introductory TypeScript workshop for beginners.
 
+
 ## Slides
 
 [bit.ly/muses-code-ts](http://bit.ly/muses-code-ts)
 
+## Setup
+download or clone the repo.
+
+### for exercises 1-3:
+
+install dependencies:
+```
+yarn
+```
+or
+```
+npm install
+```
+
+### for exercise 4
+navigate to app folder and install dependencies
+```
+cd app
+yarn
+```
+or
+```
+cd app
+npm install
+```
+
+
 
 ## Author
 Leo Caseiro
-github: [https://github.com/leocaseiro](https://github.com/leocaseiro)
-twitter: [@leocaseiro](https://twitter.com/leocaseiro)
+* github: [https://github.com/leocaseiro](https://github.com/leocaseiro)
+* twitter: [@leocaseiro](https://twitter.com/leocaseiro)