Update examples

• Remove outdated example.
• Update project structure - remove root workspace.
• App messenger example.
• Update README.md.

.swiftpm/xcode/xcshareddata/xcschemes/elixxir-dapps-sdk-swift-Package.xcscheme

@@ -34,6 +34,34 @@
                ReferencedContainer = "container:">
             </BuildableReference>
          </BuildActionEntry>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "NO"
+            buildForArchiving = "NO"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "XXClientTests"
+               BuildableName = "XXClientTests"
+               BlueprintName = "XXClientTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "NO"
+            buildForArchiving = "NO"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "XXMessengerClientTests"
+               BuildableName = "XXMessengerClientTests"
+               BlueprintName = "XXMessengerClientTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
       </BuildActionEntries>
    </BuildAction>
    <TestAction