add shape picker for backgrounds

Shared/Models/DiamondView.swift

@@ -0,0 +1,31 @@
+//
+//  DiamondView.swift
+//  Feels
+//
+//  Created by Trey Tartt on 3/20/22.
+//
+
+import SwiftUI
+
+struct Diamond:Shape {
+
+    func path(in rect: CGRect) -> Path {
+        var path = Path()
+        // get the center of the rect
+        let center = CGPoint(x: rect.midX, y: rect.midY)
+        // get the starting of our drawing the right side of our diamond
+        let startingPoint = CGPoint(x: rect.maxX, y: center.y)
+        // move our start of drawing to the beggining point
+        path.move(to: startingPoint)
+        // distance / 2 is our height
+        // create all our points
+        let secondPoint = CGPoint(x: center.x, y: rect.maxY)
+        let thirdPoint = CGPoint(x: rect.minX , y: center.y)
+        let fourthPoint = CGPoint(x: center.x, y: rect.minY)
+        path.addLine(to: secondPoint)
+        path.addLine(to: thirdPoint)
+        path.addLine(to: fourthPoint)
+        path.addLine(to: startingPoint)
+        return path
+    }
+}