create/receive call guide SWML Example

[Manny-r31]

Documentation Update Pull Request

Description

Added SWML example to create/receive call guide

Related Issue

If there's an issue available, link it here: #614

Type of Change

• Update to existing documentation

Documentation Change Details

Changes Summary:

• Added example utilizing SignalWire REST API to create calls
• Formatted cXML example, but did not make any large changes to its contents.

Motivation and Context

Solves #614 , continues effort towards SWML examples being present across every get started guide

Checklist:

• My documentation follows the style guidelines of this project
• I have performed a self-review of my documentation
• My changes generate no new warnings
• Builds successfully locally

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