PR:

Data structure definition in code
provider_ids from json to dictionary
Change invoker dictionaries

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Co-authored-by: JorgeEcheva26 <jorge.echevarriauribarri.practicas@telefonica.es>
Co-authored-by: Daniel García <daniel.garciasanchez@telefonica.com>

PR:
- Improved documentation,
- Added and improved network-app samples,
- License draft v0.1.

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Co-authored-by: JorgeEcheva26 <jorge.echevarriauribarri.practicas@telefonica.es>
Co-authored-by: Daniel García <daniel.garciasanchez@telefonica.com>

* Fix broken links and removed duplicated content from main doc.
* Update ToC

PR:
- Included complete Network App samples,
- Complete developer path description,
- Refactored code structure,
- Complete doc upgrade.

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Co-authored-by: JorgeEcheva26 <jorge.echevarriauribarri.practicas@telefonica.es>
Co-authored-by: Daniel García <daniel.garciasanchez@telefonica.com>