feat: add quickstart demo application (#158)

example/quickstart/default/kcl.mod

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+[package]
+
+[dependencies]
+kam = { git = "https://github.com/KusionStack/kam.git", tag = "0.2.0" }
+service = { oci = "oci://ghcr.io/kusionstack/service", tag = "0.1.0" }
+mysql = { oci = "oci://ghcr.io/kusionstack/mysql", tag = "0.2.0" }
+network = { oci = "oci://ghcr.io/kusionstack/network", tag = "0.2.0" }

example/quickstart/default/main.k

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+# The configuration codes in perspective of developers.
+import kam.v1.app_configuration as ac
+import service
+import service.container as c
+import network as n
+import mysql
+
+# Please replace the ${APPLICATION_NAME} with the name of your application, and complete the 
+# 'AppConfiguration' instance with your own workload and accessories.
+quickstart: ac.AppConfiguration {
+	workload: service.Service {
+		containers: {
+			quickstart: c.Container {
+				image: "kusionstack/kusion-quickstart:latest"
+				env: {
+					"DB_HOST": "$(KUSION_DB_HOST_QUICKSTART_DEFAULT_QUICKSTART_MYSQL)"
+					"DB_USERNAME": "$(KUSION_DB_USERNAME_QUICKSTART_DEFAULT_QUICKSTART_MYSQL)"
+					"DB_PASSWORD": "$(KUSION_DB_PASSWORD_QUICKSTART_DEFAULT_QUICKSTART_MYSQL)"
+				}
+			}
+		}
+	}
+	accessories: {
+		"network": n.Network {
+			ports: [
+				n.Port {
+					port: 8080
+				}
+			]
+		}
+		"mysql": mysql.MySQL {
+			type:   "local"
+			version: "8.0"
+		}
+	}
+}

example/quickstart/default/stack.yaml

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+# The metadata information of the stack. 
+name: default

example/quickstart/project.yaml

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+name: quickstart