implemented installation guide to README.md

Author: A1tura

README.md

@@ -63,13 +63,21 @@ f(x)=E+log(x)*2
 
 To see the complete list of supported math functions, please check the [wiki](https://github.com/leonhma/obsidian-functionplot/wiki).
 
+## How to Install
+
+1. ```` git clone https://github.com/leonhma/obsidian-functionplot /path/to/.obsidian/.plugins/
+2. ```` cd /path/to/.obsidian/.plugins/ ````
+2. ```` npm install ````
+3. ```` npm run build ````
+4. Open Obsidian, go to Settings → Community Plugins, and Enable the plugin.
+
 ## ⚙ Plugin Settings
 
 Since version `1.2.0` there's a dedicated settings page for this plugin. Here you can adjust things like font sizes for the text elements of the plot, line widths and various colors. To access this page, head to the obsidian settings and scroll down the list to 'Community Plugins > Obsidian Functionplot'.
 
 ![Settings Page](https://github.com/leonhma/obsidian-functionplot/blob/master/images/settings/dark.png)
 
-> **Note**  
+> **Note**
 > For changes to be applied, Obsidian needs to "re-render" the chart. You can either restart Obsidian, or switch between view modes (eg. Reading mode > Edit mode > Reading mode).
 
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