update readme

README.md

@@ -1,3 +1,41 @@
 # gosince
 
-gosince shows the introducing version of a go package or symbol, then display go doc information about it.
+gosince shows the introducing version of a go package or symbol, has a flag to call `go doc` about it.
+
+## Getting started
+
+Install via [Homebrew](https://brew.sh/)
+
+```console
+$ brew tap dvaumoron/tap
+$ brew install gosince
+```
+
+Or get the [last binary](https://github.com/dvaumoron/gosince/releases) depending on your OS.
+
+```console
+$ gosince SliceHeader
+found reflect SliceHeader added in go1 and deprecated in go1.21
+```
+
+```console
+$ gosince -h
+gosince shows the introducing version of a go package or symbol, find more details at : https://github.com/dvaumoron/gosince
+
+Usage of gosince:
+gosince <pkg>
+gosince <sym>
+gosince <pkg>.<sym>[.<methodOrField>]
+gosince <pkg> <sym>[.<methodOrField>]
+
+Usage:
+  gosince expr1 [expr2] [flags]
+
+Flags:
+  -p, --cache-path string    Local path to cache the retrieved api information (default "/home/dvaumoron/.gosince")
+  -d, --go-doc               Call go doc command
+  -h, --help                 help for gosince
+  -a, --source-addr string   Location of Go source (default "https://raw.githubusercontent.com/golang/go/master")
+  -v, --verbose              Verbose output
+      --version              version for gosince
+```