fix typo

Author: mwarning

README.md

@@ -18,10 +18,12 @@ Also part of this repository are [basic information](docs/about_mesh_networking.
 
 ## How to Use
 
-Run the program and use the command line commands to create/load a topology. Then select a routing algorithm, perform a few simulation steos and run the test command.
+Run the program and use the command line commands to create/load a topology. Then select a routing algorithm, perform a few simulation steps and run the test command.
 
 Every time toplogy or node state changes, a new graph.json file is written. You can use the [GraphViewer](https://github.com/mwarning/GraphViewer) frontend to visualize the topology and node states.
 
+
+
 ## Command Line
 
 Some commands on the command line are: