Add the document to explain how to generate i18n_resources.go (#517)
Closes #509
diff --git a/wski18n/README.md b/wski18n/README.md
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+++ b/wski18n/README.md
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+# How to generate the file of i18n_resources.go for internationalization
+
+As a contributor to wskdeploy, the file of i18n_resources.go needs to regenerated,
+when you add or change any localized message. In order to generate i18n_resources.go,
+you need to install go-bindata first:
+
+```
+$ go get -u github.com/jteeuwen/go-bindata/...
+```
+
+Then, go the HOME directory of wskdeploy and run the following command:
+
+```
+$ go-bindata -pkg wski18n -o wski18n/i18n_resources.go wski18n/resources;
+```
+
+Finally, add the default ASF license header to i18n_resources.go. Since each file of
+source code starts with the ASF license header, you need to add it to i18n_resources.go
+each time it is regenerated. You can find this license header in any other file of source
+code, e.g. i18n.go.
