added Type Jam puzzle app for review (#1554)

* added Type Jam puzzle app for review

* pr round 2 prep

* updated ci scripts for varfont_shader_puzzle

* resolved unused and minor variable naming issues

* rotator tiles row and col are final vars now

* removed unused import and print from production

* made constructors const where needed

* pages_flow export refactored to directly come from that file

* removed old api commented out section from FragmentShaded

* updated pubspec yaml to correct project name

* dart min version updated; removed unnecessary commented out dependencies from pubspec.yaml

* updated pubspec.yaml min flutter version to ensure FragmentShader support

* added/edited comments for explanation, esp on var fonts; removed obsolete comments

* trailing newline added to pubspec.yaml eof

experimental/varfont_shader_puzzle/.metadata

@@ -0,0 +1,45 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled.
+
+version:
+  revision: b938dc13df32cd510844863a66856dd240dc3302
+  channel: master
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: b938dc13df32cd510844863a66856dd240dc3302
+      base_revision: b938dc13df32cd510844863a66856dd240dc3302
+    - platform: android
+      create_revision: b938dc13df32cd510844863a66856dd240dc3302
+      base_revision: b938dc13df32cd510844863a66856dd240dc3302
+    - platform: ios
+      create_revision: b938dc13df32cd510844863a66856dd240dc3302
+      base_revision: b938dc13df32cd510844863a66856dd240dc3302
+    - platform: linux
+      create_revision: b938dc13df32cd510844863a66856dd240dc3302
+      base_revision: b938dc13df32cd510844863a66856dd240dc3302
+    - platform: macos
+      create_revision: b938dc13df32cd510844863a66856dd240dc3302
+      base_revision: b938dc13df32cd510844863a66856dd240dc3302
+    - platform: web
+      create_revision: b938dc13df32cd510844863a66856dd240dc3302
+      base_revision: b938dc13df32cd510844863a66856dd240dc3302
+    - platform: windows
+      create_revision: b938dc13df32cd510844863a66856dd240dc3302
+      base_revision: b938dc13df32cd510844863a66856dd240dc3302
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'