update README

README.md

@@ -5,3 +5,26 @@ The main goals of this app is to provide a way to:
 
 - encourage students to actively participate by asking simple questions 
 - gather students' reactions during on-line lecture, which gives the lecturers feedback they lack
+
+
+## Running the app
+
+This app uses [npm](https://nodejs.org/) and [deno](https://deno.land/).
+
+To run app first you need to install dependencies:
+```bash
+npm install
+```
+Next you have to build sites:
+```bash
+npm run build
+```
+And then start deno server:
+```bash
+npm run deno
+```
+
+If you want to run app in developent mode instead of two commands above run:
+```bash
+npm run launch
+```