how to type vedic mantras with swaras in Sanskrit?

Respected Scholars,
Jai Gurudev
 
please see a simple Devanagari phonetic keyboard. After installation, then 
one can type Svaras (vedic accents) by using the number keys 1, 2, 3.
http://www.mywhatever.com/sanskrit/vidyut/
 
also it might help to read
https://www.amazon.com/dp/1521159637/
 
Ashwini
https://advaita56.weebly.com/books.html