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

Sources/hpa/VaultCommands/EncryptCommand.swift

@@ -0,0 +1,23 @@
+import ArgumentParser
+
+struct EncryptCommand: AsyncParsableCommand {
+
+  static let commandName = "encrypt"
+
+  static let configuration = CommandConfiguration(
+    commandName: commandName,
+    abstract: createAbstract("Encrypt a vault file.")
+  )
+
+  @OptionGroup var options: VaultOptions
+
+  @Option(
+    name: .shortAndLong,
+    help: "Output file."
+  )
+  var output: String?
+
+  mutating func run() async throws {
+    fatalError()
+  }
+}