Add conditional routes example

conditional-routes/README.md

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+# Conditional Routes
+
+This example demonstrates how to enable or disable routes using command-line flags and environment variables.
+
+## Run
+
+```bash
+go run main.go
+```
+
+Enable admin routes:
+
+```bash
+go run main.go --admin
+```
+
+Enable metrics endpoint:
+
+```bash
+ENABLE_METRICS=true go run main.go
+```

conditional-routes/main.go

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+package main
+
+import (
+	"flag"
+	"net/http"
+	"os"
+
+	"github.com/gin-gonic/gin"
+)
+
+func main() {
+	enableAdmin := flag.Bool("admin", false, "Enable admin routes")
+	flag.Parse()
+
+	enableMetrics := os.Getenv("ENABLE_METRICS") == "true"
+
+	r := gin.Default()
+
+	// Public routes
+	r.GET("/", func(c *gin.Context) {
+		c.JSON(http.StatusOK, gin.H{
+			"message": "Welcome to Gin",
+		})
+	})
+
+	r.GET("/health", func(c *gin.Context) {
+		c.JSON(http.StatusOK, gin.H{
+			"status": "UP",
+		})
+	})
+
+	// Conditional admin routes
+	if *enableAdmin {
+		admin := r.Group("/admin")
+		{
+			admin.GET("/users", func(c *gin.Context) {
+				c.JSON(http.StatusOK, gin.H{
+					"message": "Admin users endpoint",
+				})
+			})
+
+			admin.GET("/settings", func(c *gin.Context) {
+				c.JSON(http.StatusOK, gin.H{
+					"message": "Admin settings endpoint",
+				})
+			})
+		}
+	}
+
+	// Conditional metrics route
+	if enableMetrics {
+		r.GET("/metrics", func(c *gin.Context) {
+			c.JSON(http.StatusOK, gin.H{
+				"requests_total": 1234,
+				"uptime":         "24h",
+			})
+		})
+	}
+
+	r.Run(":8080")
+}