Add HMI Application Custom Sounds Best Practice

[theresalech]

Resolves Issue #10

[sdl-robot]

Preview this pull request at https://smartdevicelink.com/en/guides/pull_request/0effd5b9f08fd236cc033413b9c561aea1bb7114/overview/

[sdl-robot]

Preview this pull request at https://smartdevicelink.com/en/guides/pull_request/ed25ffa45d746d12bea7f57334ece2d5561096b6/overview/

[sdl-robot]

Preview this pull request at https://smartdevicelink.com/en/guides/pull_request/4ba207d97176889ace7f5a4e768cbdbdba6b9c0d/overview/

Error - Traceback (most recent call last):
File "/opt/python/current/app/docs/tasks/docdown.py", line 41, in build_docdown_docs
config = json.load(data_file)
File "/usr/lib64/python2.7/json/init.py", line 291, in load
**kw)
File "/usr/lib64/python2.7/json/init.py", line 339, in loads
return _default_decoder.decode(s)
File "/usr/lib64/python2.7/json/decoder.py", line 364, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib64/python2.7/json/decoder.py", line 382, in raw_decode
raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded

[sdl-robot]

Preview this pull request at https://smartdevicelink.com/en/guides/pull_request/8d481f8df2a6fb5ce2c8c89f8db01d803315a96a/overview/

Error - Traceback (most recent call last):
File "/opt/python/current/app/docs/tasks/docdown.py", line 41, in build_docdown_docs
config = json.load(data_file)
File "/usr/lib64/python2.7/json/init.py", line 291, in load
**kw)
File "/usr/lib64/python2.7/json/init.py", line 339, in loads
return _default_decoder.decode(s)
File "/usr/lib64/python2.7/json/decoder.py", line 364, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib64/python2.7/json/decoder.py", line 382, in raw_decode
raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded

[sdl-robot]

Preview this pull request at https://smartdevicelink.com/en/guides/pull_request/bd815e3628b737bb7ea7c8619094fcf2624bb8ba/overview/