Add Espressif ESP-IDF template project

[gojimmypi]

Description

Adds a new, minimally viable wolfSSL example project template for the Espressif ESP-IDF using an ESP32.

I'd like to include this in my upcoming Getting Started with wolfSSL on the Espressif ESP32 webinar.

Fixes zd# n/a

Testing

How did you test?

See included README.md

Checklist

• added tests
• updated/added doxygen
• updated appropriate READMEs
• Updated manual and documentation

See #6234 for a roadmap of Espressif updates.

[gojimmypi]

@bandi13 I'm not sure if Jenkins will need any attention, but notice this example is a bit different from the others in where the expected user_settings.h file is located.

This PR has the user_settings.h in the project. The other current examples share the user_settings.h in the wolfSSL include directory.

The new method of pointing to wolfSSL source will be editing each respective project root CMakeLists.txt:

set(WOLFSSL_ROOT "~/workspace/wolfssl-other-source")

The examples here will know to find wolfSSL 7 parent directories up.

Perhaps it would be easiest for me to simply create a PR with the updated examples and see what happens.

[gojimmypi]

retest this please