Add the blog sample

examples/blog-service/.devcontainer.json

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+{
+  "image": "ballerina/ballerina-devcontainer:2201.12.0-20250310-080700-94702e9e",
+  "customizations": {
+    "vscode": {
+      "extensions": ["WSO2.ballerina"]
+    }
+  }
+}

examples/blog-service/.gitignore

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+# Ballerina generates this directory during the compilation of a package.
+# It contains compiler-generated artifacts and the final executable if this is an application package.
+target/
+
+# Ballerina maintains the compiler-generated source code here.
+# Remove this if you want to commit generated sources.
+generated/
+
+# Contains configuration values used during development time.
+# See https://ballerina.io/learn/provide-values-to-configurable-variables/ for more details.
+Config.toml

examples/blog-service/Ballerina.toml

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+[package]
+org = "demo"
+name = "blog_service"
+version = "0.1.0"
+distribution = "2201.12.0"
+
+[build-options]
+observabilityIncluded = true