Add to Setup Path Example to Engine README (#162115)

Added link to direct to engine setup and a path example.

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we expect every widget to implement].
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https://dart.googlesource.com/external/github.com/flutter/flutter/+/96e74bbb41b24baf7e725b5bd06ef72ead9768d1
diff --git a/DEPS b/DEPS
index 0504623..27d29f8 100644
--- a/DEPS
+++ b/DEPS
@@ -239,7 +239,7 @@
 deps = {
   'flutter/engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '60d98b8c81052b84a771a4b38b2fcef55a8deb3b',
 
-  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '176a7652e1f553edf1be40140a9fedbcbc1b84df',
+  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '96e74bbb41b24baf7e725b5bd06ef72ead9768d1',
 
   'flutter/engine/src/flutter/third_party/depot_tools':
   Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '580b4ff3f5cd0dcaa2eacda28cefe0f45320e8f7',
diff --git a/commits.json b/commits.json
index 3de6f69..93e5dda 100644
--- a/commits.json
+++ b/commits.json
@@ -1,4 +1,4 @@
 {
-  "flutter":"176a7652e1f553edf1be40140a9fedbcbc1b84df",
+  "flutter":"96e74bbb41b24baf7e725b5bd06ef72ead9768d1",
   "flutter/engine/src/flutter/third_party/dart":"60d98b8c81052b84a771a4b38b2fcef55a8deb3b"
 }
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