pgadmin added

pgadmin/README.md

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+docker stack deploy -c pgadmin.yml pgadmin
+

pgadmin/pgadmin.yml

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+version: "3.8"
+
+services:
+  pgadmin:
+    image: dpage/pgadmin4:8.12
+    deploy:
+      mode: replicated
+      replicas: 1
+    environment:
+      PGADMIN_DEFAULT_EMAIL: emrekirman10@gmail.com
+      PGADMIN_DEFAULT_PASSWORD: eE24619840420*
+      PGADMIN_LISTEN_PORT: 80
+    volumes:
+      - pgadmin_data:/var/lib/pgadmin
+    networks:
+      - postgres_network
+volumes:
+  pgadmin_data:
+networks:
+  postgres_network:
+    external: true