doc: update README

Signed-off-by: Roman Volosatovs <[email protected]>

README.md

@@ -1,11 +1,19 @@
 # Description
 
-`wadge` is a testing framework, which lets you test your WebAssembly applications natively and using all your existing development tools (e.g. debuggers).
+`wadge` is WebAssembly bridge allowing native applications invoke Wasm functions, normally provided by a Wasm runtime.
+Main use cases for this project are:
+- Testing WebAssembly applications natively, using existing development tools (e.g. debuggers)
+- Extending native applications with WebAssembly plugins
 
 ## Go
 
-`wadge` provides `wadge-bindgen-go` utility, which walks the complete AST of your application and generates a binding file, which replaces functions with `wasmimport` directives, normally provided by the runtime, by a native implementation, which invokes those imports on a WebAssembly component (harness) running in an embedded Wasmtime instance. This lets you test you applications without changing implementation and achieving full test coverage.
+`wadge` provides `wadge-bindgen-go` utility, which walks the complete AST of your application and generates a binding file, `bindings.wadge.go` by default.
+
+The bindings file utilizes `//go:linkname` directives to replace unimplemented functions with `//go:wasmimport` directives, normally provided by the runtime,
+using a native implementation, which invokes those imports on a WebAssembly component running in an embedded `wadge` instance.
+
+For testing, Go library provides `RunTest` function, which plugs into the Go standard library `testing` framework.
 
 # Design
 
-`wadge` uses [`cabish`](https://github.com/wasmCloud/cabish) to read and write values over FFI to pass to embedded Wasmtime instance.
+`wadge` uses [`cabish`](https://github.com/wasmCloud/cabish) to read and write values over FFI to pass to an embedded WebAssembly runtime ([Wasmtime](https://github.com/bytecodealliance/wasmtime)).