update

pgsql/Demo/SingleNode/README.md

@@ -0,0 +1,21 @@
+# 部署 PostgreSQL 单节点
+
+- 按实际环境修改
+    - docker-compose.yml
+    - pgsql/conf.d/\*.cnf
+
+- 创建目录
+    ```
+    grep '\<source:' docker-compose.yml | cut -d: -f2 | xargs mkdir -p
+    ```
+
+- 启动
+    ```
+    docker-compose up -d
+    ```
+
+- 查看日志，直至出现 "PGSQL is ready for connections."
+    ```
+    docker-compose logs pgsql
+    ```
+