docs: add installing app section

README.md

@@ -8,6 +8,7 @@ This is a [Trybe](https://www.betrybe.com/) project developed as part of the Fro
 - [Summary](#summary)
 - [Context](#context)
 - [Technologies Used](#technologies-used)
+- [Installing, running and testing the app](#installing-running-and-testing-the-app)
 - [Notes](#technologies-used)
   - [Git and Commits](#git-and-commit)
   - [Further Improvements](#further-improvements)
@@ -34,6 +35,23 @@ This project used the following technologies and features:
 
 ---
 
+# Installing, running and testing the app
+### Install dependencies
+```
+cd trybewallet
+npm install
+```
+### Run the application
+```
+cd trybewallet
+npm start
+```
+### Run tests
+```
+npm test
+```
+---
+
 # Notes
 ### Git, GitHub and Commit History
 - There are only two branches since this is a solo project. One is the *main*, with production ready features. And the other one is *project_refactor*, where I improve the code and add new features.