Add 'How it works'

How-it-works.md

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+## Logic
+The program attempts to ping the requested device 5 times, and if it responds, report it up. Otherwise, report it down.
+It saves this information to the console as well as an outputed file, `pingResults.csv`.
+
+## Program flow
+The program does the following
+1. The program attempts to read in from the file to a vector containing the device name and associated ip
+2. The program sets up the output file, ensuring that it exsists and writes header information
+3. The program iterates through each device and creates a runner job for each device
+4. The program creates a logging thread that handles writing to the console and appending to the file
+5. The program begins to execute the threads and writes the information out
+6. The program closes the execuation stack and the logging thread
+7. The program writes to the file and exits
+
+## Status information
+The program attempts to ping each device 5 times, if more then 50% of the pings make it through, it reports the device as up