Add Choreo related template and config files

ui2/.devcontainer.json

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+{
+    "image": "ballerina/ballerina-devcontainer:2201.3.1",
+    "extensions": ["WSO2.ballerina"],
+}

ui2/.gitignore

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+target

ui2/Ballerina.toml

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+[build-options]
+  observabilityIncluded = true
+
+[package]
+  distribution = "2201.3.1"
+  name = "empty_sample"
+  org = "selvaratnamuthaiyashankar"
+  version = "0.1.0"
+

ui2/Cloud.toml

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+[settings]
+  buildImage = false
+  thinJar = false
+

ui2/service.bal

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+import ballerina/http;
+
+# A service representing a network-accessible API
+# bound to port `9090`.
+service / on new http:Listener(9090) {
+
+    # A resource for generating greetings
+    # + name - the input string name
+    # + return - string name with hello message or error
+    resource function get greeting(string name) returns string|error {
+        // Send a response back to the caller.
+        if name is "" {
+            return error("name should not be empty!");
+        }
+        return "Hello, " + name;
+    }
+}