feat: Begins room-pressure calculator

Sources/ViewController/Extensions/HTMLAttributeExtensions.swift

@@ -2,6 +2,10 @@ import Elementary
 
 extension HTMLAttribute where Tag == HTMLTag.input {
 
+  static func max(_ value: String) -> Self {
+    .init(name: "max", value: value)
+  }
+
   static func min(_ value: String) -> Self {
     .init(name: "min", value: value)
   }