adding readme

Author: wuzinong

README.MD

@@ -0,0 +1,19 @@
+# Updating document
+
+The source code of the document is [here](https://github.com/dnvgl/WebAppTemplate/tree/release/documentation).
+Since the source code repo is internal so only people in the orgnization can visit it.
+
+# Publish document
+
+### Go to **Actions**
+
+### Click Deploy static content to Pages
+
+### Run workflow with **main** branch which is the default branch
+
+# Error handling
+
+Since the orgnization has enforced SMAL SSO so you will get the error with 403
+Click the link to authenticate and retry the step
+
+![error](/assets/error.png 'error')