added inputs components and created page for fifth lab

src/model/builder_traits.rs

@@ -0,0 +1,17 @@
+pub trait Product<B, T> {
+
+    fn builder() -> B;
+
+    fn get(self) -> T;
+
+}
+
+pub trait Builder<T, I, P> {
+
+    fn build(&self, build_arg: P) -> T;
+
+    fn append_item(self, item: I) -> Self;
+
+    fn append_items(self, items: Vec<I>) -> Self;
+
+}