new ruling authoritory for Gorkha occupations [επιλυμένο]

also add gorkha occupation as a period

add Girvan Yuddha Bikram Shah (1799-1816) as a ruling authority to the following:

1)Kingdom of Kumaon

Example: 1 Paisa - Girvan Yuddha Bikram Shah [Gurkha Occupation] (Kumaon) 

2)Kingdom of Garhwal
Example:Timsha - Girvan Yuddha 
 3) Princely state of Sirmur

To be added:Princely state of Sirmur --- new issuer

@Jarcek @tdziemia @sujit_kumar can we finish this, thanks 

Addition of the Gorkha period and some other ruling authorities of these places is complete.