docs: add install guide

Author: wilsonehusin

README.md

@@ -2,10 +2,20 @@
 
 Generate executable alias for Go build-time dependencies / third-party `go tool`. Inspired by Ruby Bundler's `bundle binstubs`.
 
-## Example
+## Install
 
 ```shellsession
-$ toolstub github.com/golangci/golangci-lint/cmd/golangci-lint
+# go run go.husin.dev/toolstub@latest -tool go.husin.dev/toolstub
 ```
 
-And the generated output will be [a bash script wrapping `go` commands](bin/golangci-lint).
+## Usage
+
+```shellsession
+# toolstub github.com/golangci/golangci-lint/cmd/golangci-lint
+```
+
+And the generated output will be [a bash script in `bin/golangci-lint` wrapping various `go` commands](bin/golangci-lint).
+
+Running the program is as boring as executing `bin/golangci-lint`. First run will be slower due to installation and subsequent runs will be instant.
+
+The versioning and dependencies are tracked in `_tools/golangci-lint.go.{mod,sum}`, which can be tracked by dependency managers like Dependabot.