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HOW_TO.md

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+###*First check it exists a version of your library compatible with the version of Angular defined in package.json.*
+
+### How to install ng-bootstrap
+
+``` bash
+ng add @ng-bootstrap/ng-bootstrap
+```
+
+### How to install ngx-bootstrap
+
+``` bash
+ng add ngx-bootstrap
+```
+
+### How to install Angular Material
+
+Add Angular Material using `ng add` command:
+
+``` bash
+ng add @angular/material
+```
+You will get the following questions:
+
+``` bash
+? Choose a prebuilt theme name, or "custom" for a custom theme: *Choose any theme you like here*
+? Set up global Angular Material typography styles? *Yes* 
+? Set up browser animations for Angular Material? *Yes*
+```
+Angular Material will start installing, but you will get the following error after installation:
+
+``` bash
+Your project is not using the default builders for "build". The Angular Material schematics cannot add a theme to the workspace configuration if the builder has been changed.
+```
+*No need to Panic!* Just add your desired theme in style.scss:
+
+``` bash
+import '@angular/material/prebuilt-themes/indigo-pink.css'
+```
+Angular Material Library is now installed in your project.