Add LinkedIn obtaining api keys instructions

README.md

@@ -177,6 +177,23 @@ app.get('/auth/facebook/callback', passport.authenticate('facebook', { successRe
 
 <hr>
 
+<img src="http://cdn3.tnwcdn.com/wp-content/blogs.dir/1/files/2013/11/linkedin_logo_11.jpg" width="200">
+- Sign in at [LinkedIn Developer Network](http://developer.linkedin.com/)
+- From the account name dropdown menu select **API Keys**
+ - It might ask you to sign in once again
+- Click on **+ Add New Application**
+- Fill in all the required fields
+- For **Default Scope** make sure *at least* the following is checked:
+ - **r_basicprofile**
+ - **r_emailaddress**
+- For **OAuth 1.0 Accept Redirect URL**: http://localhost:3000/
+- Click on **Add Application** button
+- Copy and paste *OAuth User Token* and *OAuth User Secret* keys into `config/secrets.js`
+ - *API Key* is your **clientID**
+ - *Secret Key* is your **clientSecret**
+
+<hr>
+
 <img src="https://s3.amazonaws.com/venmo/venmo_logo_blue.png" width="200">
 - Visit the **Account** section of your Venmo profile after logging in
 - Click on the **Developers** tab