refactor: Start implementation of public API

pkg/config/config.go

@@ -0,0 +1,18 @@
+package config
+
+type StateConfig struct {
+	Drive    string
+	Metadata string
+}
+
+type PipeConfig struct {
+	Compression string
+	Encryption  string
+	Signature   string
+}
+
+type CryptoConfig struct {
+	Recipient interface{}
+	Identity  interface{}
+	Password  string
+}