add very basic README

README.md

@@ -0,0 +1,25 @@
+# ssh_config
+
+This is a Go parser for `ssh_config` files. Importantly, this parser attempts to
+preserve comments, so you can manipulate a `ssh_config` file from a program, if
+your heart wishes.
+
+Example usage:
+
+```go
+f, _ := os.Open(filepath.Join(os.Getenv("HOME"), ".ssh", "config"))
+cfg, _ := ssh_config.LoadReader(f)
+for _, host := range cfg.Hosts {
+    fmt.Println("patterns:", host.Patterns)
+    for _, node := range host.Nodes {
+        fmt.Println(node.String())
+    }
+}
+
+// Write the cfg back to disk:
+fmt.Println(cfg.String())
+```
+
+This is very alpha software. In particular the most useful thing you want to do
+with this is figure out the correct HostName and User for a particular host
+pattern. There's no way to do this, currently.