feat: config auto-generation

`cheat` now attempts to auto-generate a config file if one cannot be
found on the filesystem.

internal/config/init.go

@@ -0,0 +1,24 @@
+package config
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+)
+
+// Init initializes a config file
+func Init(confpath string, configs string) error {
+
+	// assert that the config directory exists
+	if err := os.MkdirAll(filepath.Dir(confpath), 0755); err != nil {
+		return fmt.Errorf("failed to create directory: %v", err)
+	}
+
+	// write the config file
+	if err := ioutil.WriteFile(confpath, []byte(configs), 0644); err != nil {
+		return fmt.Errorf("failed to create file: %v", err)
+	}
+
+	return nil
+}