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

Sources/hpa/Internal/Constants.swift

@@ -0,0 +1,17 @@
+import Rainbow
+
+// Constant string values.
+enum Constants {
+  static let appName = "hpa"
+  static let playbookFileName = "main.yml"
+  static let inventoryFileName = "inventory.ini"
+  static let importantExtraArgsNote = """
+
+  \("IMPORTANT NOTE".bold.underline): \("""
+    Any extra arguments to pass to the underlying command invocation have to
+    be at the end with `--` before any arguments otherwise there will
+    be an "Unkown option" error. See examples above.
+    """.italic
+  )
+  """.red
+}