Create COVID19-APP.md

Added a COVID-19 tracker app idea in intermediate section

Projects/2-Intermediate/COVID19-App.md

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+# COVID-19 Tracker App
+
+**Tier:** 2-Intermediate
+
+
+-   It shows the current status of COVID-19 cases in every country.
+-   Postman API https://documenter.getpostman.com/view/10808728/SzS8rjbc can be used to collect current status of all countries.
+
+## User Stories
+
+-   [ ] User can see a world map with the number of COVID-19 active cases visible for each country
+-   [ ] User can click on a particular country to see detailed status of COVID-19 in that country. For example: Total recovered cases, death ratio etc. 
+-   [ ] User can see coloured transclucent circles on each country on the map. The greater the COVID-19 cases for a country, the greater will be the color intensity of the circle.
+
+
+## Bonus features
+
+-   [ ] User can take an assessment to check whether they have COVID-19 symptoms.
+-   [ ] User can see the status COVID-19 cases for different states in a country when the circle on the country is clicked.
+
+## Useful links and resources
+
+-   https://www.freecodecamp.org/news/how-to-create-corona-tracker-app-in-3-days/
+-   https://www.geeksforgeeks.org/how-to-create-a-covid-19-tracker-android-app/
+
+## Example projects
+-   https://www.covid19india.org/
+
+
+