update info of infra/README.md

Signed-off-by: twilight0620 <liuhuiling4@huawei.com>
Change-Id: I59b13df809a04019f46306675ba7dc17a3741ddf

diff --git a/ocd/infra/README.md b/ocd/infra/README.md
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--- a/ocd/infra/README.md
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 # OCD for ealt-edge
-Ansible playbooks for ealt-edge
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+It contains ansible scripts for EALTEdge stack deployment.
+
+This contains the config.yml which helps to configure the edge gallery deployment.   
+config.yml which contains variable for which user needs to provide values for deployment of EALTEdge stack.
+
+ealt-all.yml and ealt-all-uninstall.yml which helps to install and uninstall the platform respectively.   
+In general, the above path contains config files to deploy the platform.
+
+ealt-eg-aio-latest.yml and ealt-eg-aio-unins-latest.yml which helps to install and uninstall the edge gallery in one node respectively. 
+
+ealt-eg-muno-controller.yml which helps to install and uninstall the controller node of edge gallery when deploying in multi nodes. 
+
+ealt-eg-muno-edge.yml which helps to install and uninstall the edge node of edge gallery when deploying in multi nodes. 
+
+ealt-inventory.ini for user to specify node informations.
+
+In the directory of roles, it contains the ansible playbook roles which internally provides the functionalities of EALTEdge Blueprint.
+Each role corresponds to specific functionalities of EALTEdge.
+
+In the directory of muno-config, it contains the controller node config info and edge node config info of deploying in multi nodes.