Add Additional Baanis and Granths

[bogas04]

• [ ] Bhai Gurdas Ji's Vaaran
• [ ] Bhai Nand Laal's Ghazals
• [ ] Dasam Patsahi Ka Granth
• [ ] Sarabloh Granth
• [ ] Rehit Naame
• [ ] Rehit Maryada
• [ ] Mahaan Kosh
• [ ] Shashtar Naammaala with pictures of each would be cool
• [ ] Janam/Jeevan Sakhis

It would be great if contributors can help in finding proper sources for the same and generate .md files in unicode/gurakhar font.

[bogas04]

GurbaniNow API now has following granths:

• G - Guru Granth Sahib Ji
• D - Dasam Granth Sahib
• B - Bhai Gurdas Ji Vaaran
• N - Bhai Nand Lal Ji Vaaran
• A - Amrit Keertan
• U - Uggardanti