Build exchange workspace and shared transaction services (#28)

frontend/app/pubspec.lock

@@ -494,6 +494,13 @@ packages:
       relative: true
     source: path
     version: "0.1.0"
+  sxchnge_wallet:
+    dependency: "direct main"
+    description:
+      path: "../packages/sxchnge_wallet"
+      relative: true
+    source: path
+    version: "0.1.0"
   term_glyph:
     dependency: transitive
     description: