Update README with better examples

README.md

@@ -29,31 +29,28 @@ go test -v -race -cover github.com/Luzifer/rconfig
 
 ## Usage
 
-As a first step define a struct holding your configuration:
+A very simple usecase is to just configure a struct inside the vars section of your `main.go` and to parse the commandline flags from the `main()` function:
 
 ```go
-type config struct {
+package main
+
+import (
+  "fmt"
+  "github.com/Luzifer/rconfig"
+)
+
+var (
+  cfg = struct {
     Username string `default:"unknown" flag:"user" description:"Your name"`
     Details  struct {
       Age int `default:"25" flag:"age" env:"age" description:"Your age"`
     }
-}
-```
+  }{}
+)
 
-Next create an instance of that struct and let `rconfig` fill that config:
-
-```go
-var cfg config
-func init() {
-  cfg = config{}
-  rconfig.Parse(&cfg)
-}
-```
-
-You're ready to access your configuration:
-
-```go
 func main() {
+  rconfig.Parse(&cfg)
+
   fmt.Printf("Hello %s, happy birthday for your %dth birthday.",
     cfg.Username,
     cfg.Details.Age)
@@ -72,18 +69,14 @@ The order of the directives (lower number = higher precedence):
 1. `default` tag in the struct
 
 ```go
-type config struct {
+var cfg = struct {
   Username string `vardefault:"username" flag:"username" description:"Your username"`
 }
 
-var cfg = config{}
-
-func init() {
+func main() {
   rconfig.SetVariableDefaults(rconfig.VarDefaultsFromYAMLFile("~/.myapp.yml"))
   rconfig.Parse(&cfg)
-}
 
-func main() {
   fmt.Printf("Username = %s", cfg.Username)
   // Output: Username = luzifer
 }