steps to add/update dependencies in netplugin using godep

docs/GoDep.md

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+# Dependency management in netplugin
+This document explains the steps for vendoring update packages in netplugin
+
+## Table of Contents
+- [Audience](#audience)
+- [Restoring dependencies](#restoring-dependencies)
+- [Adding new dependencies](#adding-new-dependencies)
+- [Updating existing dependencies](#updating-existing-dependencies)
+
+## Audience
+This document is targeted towards the developers looking into or working on
+adding/updating vendored packages in netplugin/Godeps.
+
+## Restoring dependencies
+- netplugin/Godeps/Godeps.json has information about the vendored packages.
+- `godep restore` can be used to copy these packages to $GOPATH/src
+- It restores the packages in $GOPATH to a state expected by netplugin
+- note: changes(if any) in $GOPATH/src will be over-written
+```
+cd netplugin
+godep restore
+```
+
+## Adding new dependencies
+
+- Add the new package to your $GOPATH/src
+```
+go get pkg_url 
+```
+
+- From within the netplugin directory run `godep save`, which will copy relevant 
+packages from `$GOPATH/src` to `netplugin/Godeps/_workspace`. It will also update 
+`netplugin/Godeps/Godeps.json`
+
+```
+cd netplugin
+godep save ./...
+```
+
+- Verify the changes by running `git status` in netplugin directory. 
+Verify that package is added to `Godeps/_workspace/src` and that 
+`Godeps/Godeps.json` also reflects it
+
+```
+git status
+```
+
+## Updating existing dependencies
+- Go to the `$GOPATH/directory` which hosts the package and update the package
+```
+cd $GOPATH/src/github.com/samalba/dockerclient
+
+# update the package to the master
+git checkout master
+```
+
+- From within the netplugin directory execute a `godep update pkg` to update the
+Godeps
+```
+godep udpate github.com/samalba/dockerclient
+```
+
+- Verify the changes by running `git status` in netplugin directory. 
+Verify that package is added to `Godeps/_workspace/src` and that 
+`Godeps/Godeps.json` also reflects the version change 
+
+```
+git status
+```
+
+