feat: Begins vault commands, adds nodes for rendering discussion documentation.

Sources/hpa/VaultCommands/VaultCommand.swift

@@ -0,0 +1,14 @@
+import ArgumentParser
+
+struct VaultCommand: AsyncParsableCommand {
+
+  static let commandName = "vault"
+
+  static let configuration = CommandConfiguration(
+    commandName: commandName,
+    abstract: createAbstract("Vault commands."),
+    subcommands: [
+      EncryptCommand.self, DecryptCommand.self
+    ]
+  )
+}