Adding Arduino as ISP sketch (firmware) and programmers.txt entry.
Adding Arduino as ISP sketch (firmware) and programmers.txt entry.



Former-commit-id: c6b305357e7b6e0332b9dfd94539b00ea2d25600

majenkotech/chipKIT-core,adamwolf/chipKIT-core,adamwolf/chipKIT-core,majenkotech/chipKIT-core,UECIDE/chipKIT-core,pontech/chipKIT-core,pontech/chipKIT-core,pontech/chipKIT-core,chipKIT32/chipkit-core,chipKIT32/chipkit-core,adamwolf/chipKIT-core,ricklon/chipKIT-core,UECIDE/chipKIT-core,EmbeddedMan/chipKIT-core,pontech/chipKIT-core,adamwolf/chipKIT-core,EmbeddedMan/chipKIT-core,EmbeddedMan/chipKIT-core,EmbeddedMan/chipKIT-core,ricklon/chipKIT-core,EmbeddedMan/chipKIT-core,majenkotech/chipKIT-core,majenkotech/chipKIT-core,majenkotech/chipKIT-core,ricklon/chipKIT-core,UECIDE/chipKIT-core,EmbeddedMan/chipKIT-core,UECIDE/chipKIT-core,pontech/chipKIT-core,ricklon/chipKIT-core,ricklon/chipKIT-core,chipKIT32/chipkit-core,pontech/chipKIT-core,chipKIT32/chipkit-core,adamwolf/chipKIT-core,majenkotech/chipKIT-core,adamwolf/chipKIT-core,UECIDE/chipKIT-core,majenkotech/chipKIT-core,ricklon/chipKIT-core,chipKIT32/chipkit-core,pontech/chipKIT-core,adamwolf/chipKIT-core,EmbeddedMan/chipKIT-core