Created How to Build (markdown)

How-to-Build.md

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+# How to build and run Sengi
+## Prerequisites 
+### Node.js
+
+You will need [Node.js](https://nodejs.org/en/) v10 installed
+(due to Angular 7 incompatibilities, don't use v11 or higher)
+
+### Angular CLI
+
+If you never installed Angular CLI, run:
+```
+npm install @angular/cli --global
+```
+
+## Restore packages 
+In the root folder, run:
+```
+npm install
+```
+
+## Build and run the project
+Here are the most common commands:
+### Run angular 
+```
+npm start
+```
+
+### Run electron
+```
+npm run electron
+```
+
+### Build angular for publication 
+
+```
+npm run build
+```
+
+
+### Run unit tests
+
+```
+npm test
+```
+
+