Zscaler-api-talkers

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1. Updated README file (by `Sergio Pereira <mailto:spereirazscaler.com>`_)
- Updated instructions of zpa usage
- Added method to create access policy
- Added method to obtain VPN credentials in zia_talker
- Added method to add static IP address in zia_talker

2. Updated zpa_talker for SAML method (by `Rohit Luthra <mailto:rluthrazscaler.com>`_)
- Added method for SAML Attribute pull from the customer portal
- Added method for fetching the global policy Global policy ID

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1. Released Version 1.0 (by `Sergio Pereira <mailto:spereirazscaler.com>`_)
- zia_talker: Class to consume ZIA public API
- zpa_talker: Class to consume ZPA public API
- helpers
-http_calls: Class to perform HTTP calls
- Docs
-Changelog.rst: Tracks changes made
-Contributing.rst: Contribution guidelines
- requirements.txt: Repository packages dependency