feat: Adds view snapshot tests

Sources/HTMLSnapshotTesting/Snapshotting.swift

@@ -0,0 +1,22 @@
+import Elementary
+import SnapshotTesting
+
+extension Snapshotting where Value == (any HTML), Format == String {
+  public static var html: Snapshotting {
+    var snapshotting = SimplySnapshotting.lines
+      .pullback { (html: any HTML) in html.renderFormatted() }
+
+    snapshotting.pathExtension = "html"
+    return snapshotting
+  }
+}
+
+extension Snapshotting where Value == String, Format == String {
+  public static var html: Snapshotting {
+    var snapshotting = SimplySnapshotting.lines
+      .pullback { $0 }
+
+    snapshotting.pathExtension = "html"
+    return snapshotting
+  }
+}