Add BGNPCGN Dzongkha system 2010

[ronaldtse]

Originally by @manuel489 from interscript/interscript-ruby#26

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From @manuel489

I used the following chart to find relevant unicode values:
https://www.unicode.org/charts/PDF/U0F00.pdf

And the following link to convert them into characters:
https://www.branah.com/unicode-converter

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From @ronaldtse

Currently failing on these tests:

16)Interscriptmaps/bgnpcgn-dzo-Tibt-Latn-2010.yamlsystemtestfor{"source"=>"ཐྀམ་ཕུ","expected"=>"Thimphu"}Failure/Error: expect(result).toeq(test["expected"])expected: "Thimphu"got: "thaྀm་phaུ"(comparedusing ==)# ./spec/interscript_spec.rb:13:in `block (5 levels) in <top (required)>'17)Interscriptmaps/bgnpcgn-dzo-Tibt-Latn-2010.yamlsystemtestfor{"source"=>"བཀྲ་ཤིས་གྱང་ཙེ","expected"=>"Trashi Yangtse"}Failure/Error: output[pos,match.size]=resultTypeError:
noimplicitconversionofArrayintoString# ./lib/interscript.rb:48:in `[]='# ./lib/interscript.rb:48:in `block in transliterate'# ./lib/interscript.rb:44:in `each'# ./lib/interscript.rb:44:in `transliterate'# ./spec/interscript_spec.rb:12:in `block (5 levels) in <top (required)>'18)Interscriptmaps/bgnpcgn-dzo-Tibt-Latn-2010.yamlsystemtestfor{"source"=>"སྟང་སི་སྦྱིས","expected"=>"Tangsibji"}Failure/Error: expect(result).toeq(test["expected"])expected: "Tangsibji"got: "ྟng་ི་ྦྱི"(comparedusing ==)# ./spec/interscript_spec.rb:13:in `block (5 levels) in <top (required)>'

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From @manuel489

I think it is worth to say that I took these tests from the notes section of the PDF file. For example: