docs(websocket): Added README for websocket host example

components/esp_websocket_client/examples/linux/README.md

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+# ESP Websocket Client - Host Example
+
+This example demonstrates the ESP websocket client using the `linux` target. It allows for compilation and execution of the example directly within a Linux environment.
+
+## Compilation and Execution
+To compile and execute this example on Linux, follow the standard procedures for building and running ESP-IDF projects under the Linux platform.
+
+## Coverage Reporting
+For generating a coverage report, it's necessary to enable `CONFIG_GCOV_ENABLED=y` option. Set the following configuration in your project's SDK configuration file (`sdkconfig.ci.coverage`, `sdkconfig.ci.linux` or via `menuconfig`):