Introduce Identity Service and its initial usage

services/identity/manifest.json

Index: services/identity/manifest.json
diff --git a/services/identity/manifest.json b/services/identity/manifest.json
new file mode 100644
index 0000000000000000000000000000000000000000..0ebd6f8e5c9782de5657a20d6ad9b780c6f4a2dd
--- /dev/null
+++ b/services/identity/manifest.json
@@ -0,0 +1,11 @@
+{
+  "name": "identity",
+  "display_name": "Identity Service",
+  "interface_provider_specs": {
+    "service_manager:connector": {
+      "provides": {
+        "identity_manager" : [ "identity::mojom::IdentityManager" ]
+      }
+    }
+  }
+}