feat: add deployments readme file

Signed-off-by: Xinwei Xiong(cubxxw-openim) <3293172751nss@gmail.com>

deployments/README.md

@@ -0,0 +1,26 @@
+# OpenIM 应用容器化部署指南
+
+OpenIM 支持很多种集群化部署方式，包括但不限于 helm, sealos, kubeam, kubesphere, kubeflow, kuboard, kubespray, k3s, k3d, k3c, k3sup, k3v, k3x
+
+### 依赖检查
+
+```bash
+Kubernetes: >= 1.16.0-0
+Helm: >= 3.0
+```
+
+假设 OpenIM 项目根目录路径为 `OpenIM_ROOT`
+
+进入 OpenIM 项目根目录
+
+$ cd ${OpenIM_ROOT}
+
+
+
+### 容器化安装
+
+具体安装步骤如下：
+
+
+
+### Helm安装