added basic skeleton and two API endpoints to test backend stack.

internal/envvars/int.go

@@ -0,0 +1,20 @@
+package envvars
+
+import (
+	"os"
+	"strconv"
+)
+
+func Int(key string) int {
+	value := os.Getenv(key)
+	if value == "" {
+		return 0
+	}
+
+	intValue, err := strconv.Atoi(value)
+	if err != nil {
+		return 0
+	}
+
+	return intValue
+}

internal/envvars/string.go

@@ -0,0 +1,7 @@
+package envvars
+
+import "os"
+
+func String(key string) string {
+	return os.Getenv(key)
+}