Update readme.md

readme.md

-
-Processing version
+**Processing version**
 
 1. Run Processing 3.x (https://processing.org/)
-2. Open sketch in Processing: nle_processing/sketch_NLE_CA/sketch_NLE_CA.pde
-3. Edit parameters at the top of the file 'sketch_NLE_CA.pde'
+2. Open sketch in Processing: `nle_processing/sketch_NLE_CA/sketch_NLE_CA.pde`
+3. Edit parameters at the top of the file `sketch_NLE_CA.pde`
 4. Run sketch
-5. Press 'H' for help
+5. Press `H` for help
 
 
-C++ version
+**C++ version**
 
-1. Go to directory nle_cpp/src
-2. Run 'make' -> excutable file 'nle' should appear
-   2.1 See program parameters by running './nle -h'
-3. Go to directory nle_cpp/scripts/run_single
-4. Edit parameters in file 'parameters.sh'
-5. Run './run.sh'
+1. Go to directory `nle_cpp/src`
+2. Run `make` - excutable file `nle` should appear (run `./nle -h` for program parameters)
+3. Go to directory `nle_cpp/scripts/run_single`
+4. Edit parameters in file `parameters.sh`
+5. Run `./run.sh`
 6. See results in a newly created directory