Feature/iot app add header and xml support

[juuso-j]

IoT APP, support for header and XML data

Trello #552

---

Breakdown:

1. iot/README.md
   • Update information
2. iot/management/commands/import_iot_data.py
   • Convert XML data to JSON
3. iot/models.py
   • Add headers and is_xml fields

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 68.12%. Comparing base (c63fd90) to head (d39b56a).

Files	Patch %	Lines
iot/models.py	28.57%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #335      +/-   ##
===========================================
- Coverage    68.13%   68.12%   -0.02%     
===========================================
  Files          238      238              
  Lines        15284    15293       +9     
  Branches      1894     1895       +1     
===========================================
+ Hits         10414    10418       +4     
- Misses        4483     4488       +5     
  Partials       387      387              

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