Add a step to make sure user has an RSA SSH key.

doc/TUTORIAL.md

@@ -7,32 +7,34 @@ Want to try awsbox?  There are a couple things you have to do:
 **1.** Create an AWS account and put your `AWS_ID` and `AWS_SECRET` in corresponding
 environment variables.
 
-**2.** Add an `.awsbox.json` file to your project that specifies what processes to run
+**2.** Generate an SSH RSA (not DSA) key with `ssh-keygen` if you don't already have one.
+
+**3.** Add an `.awsbox.json` file to your project that specifies what processes to run
 
     {
       "processes": [ "server.js" ]
     }
 
-**3.** add awsbox to your package.json as a dev dependency
+**4.** add awsbox to your package.json as a dev dependency
 
     "devDependencies": {
       "awsbox": "*"
     }
 
     You need to add this manually to `package.json` if you skipped the `--save-dev` argument in in step 0 above.
 
-**4.** set up your server to bind localhost and defer to the environment for PORT
+**5.** set up your server to bind localhost and defer to the environment for PORT
 
     app.listen(process.env['PORT'] || 3000, '127.0.0.1');
 
-**5.** Create a VM
+**6.** Create a VM
 
     $ node_modules/.bin/awsbox create -n myvm
 
-**6.** Deploy your code
+**7.** Deploy your code
 
     $ git push myvm HEAD:master
 
-**7.** Check out your handiwork!
+**8.** Check out your handiwork!
 
   Visit http://<my ip address> in your web browser.