feat: Add deployment infrastructure and documentation

Docker:
- Add production-ready Dockerfiles for all microservices
- Optimize for multi-stage builds and minimal image sizes

Kubernetes:
- Add namespace and service manifests
- Include MongoDB and Redis deployment configurations
- Configure API server and charging engine deployments

Documentation:
- Add comprehensive README with platform overview
- Include technology stack and quick start instructions
- Provide prerequisites and setup guidance

deployments/kubernetes/01-mongodb.yaml

@@ -0,0 +1,93 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: mongodb-config
+  namespace: taas-platform
+data:
+  MONGO_INITDB_DATABASE: "free5gc"
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: mongodb-secret
+  namespace: taas-platform
+type: Opaque
+stringData:
+  MONGO_INITDB_ROOT_USERNAME: "admin"
+  MONGO_INITDB_ROOT_PASSWORD: "changeme-in-production"
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: mongodb-pvc
+  namespace: taas-platform
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 10Gi
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: mongodb
+  namespace: taas-platform
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: mongodb
+  template:
+    metadata:
+      labels:
+        app: mongodb
+    spec:
+      containers:
+      - name: mongodb
+        image: mongo:7.0
+        ports:
+        - containerPort: 27017
+        env:
+        - name: MONGO_INITDB_ROOT_USERNAME
+          valueFrom:
+            secretKeyRef:
+              name: mongodb-secret
+              key: MONGO_INITDB_ROOT_USERNAME
+        - name: MONGO_INITDB_ROOT_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: mongodb-secret
+              key: MONGO_INITDB_ROOT_PASSWORD
+        - name: MONGO_INITDB_DATABASE
+          valueFrom:
+            configMapKeyRef:
+              name: mongodb-config
+              key: MONGO_INITDB_DATABASE
+        volumeMounts:
+        - name: mongodb-storage
+          mountPath: /data/db
+        resources:
+          requests:
+            memory: "512Mi"
+            cpu: "250m"
+          limits:
+            memory: "2Gi"
+            cpu: "1000m"
+      volumes:
+      - name: mongodb-storage
+        persistentVolumeClaim:
+          claimName: mongodb-pvc
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: mongodb
+  namespace: taas-platform
+spec:
+  selector:
+    app: mongodb
+  ports:
+  - port: 27017
+    targetPort: 27017
+  type: ClusterIP