smkdev-golang-public: native-frameworks boilerplate code

[sapategu]

Objectiveness

• API Introduction
• net/http for simple implementations
• API Project Structure
• Native Framework with Echo
• Routing
• Parameter & Query String
• Request & Response
• Middleware
• Static Template File Serving example_template
• Simple Testing with net/http/httptest
• Error Handling
• Introduction to OpenAPI

Note

if none link for each, that's a new PR (for each branch/bulk PR) for you