Update README.md

- Generally cleaned it up and made it more clear what a Headless Client does.
- Added Installation Requirements
- Cleaned up, and removed spelling errors in, the Additional Settings section.

steamcmd_servers/arma/arma3_headless_client/README.md

@@ -1,21 +1,27 @@
 # Arma 3 Headless Client
 ### From their [Site](https://community.bistudio.com/wiki/Arma_3_Headless_Client)
 What is a Headless Client (HC) used for?
-* Headless Client is used to offload AI calculations from the server
-* Headless Client is integrated into game client and dedicated server executable (WIndows and Linux, use -client parameter)
-* The server doesn't allow arbitrary connections from headless clients if you do not define the headless clients IPs in the server.cfg,
+* Headless Client is used to offload AI calculations from the server [to improve the main server's performance].
+* Headless Client is integrated into dedicated server executable, and uses the `-client` parameter to activate.
+* The server doesn't allow arbitrary connections from headless clients if you do not define the headless clients' IPs in the `server.cfg`.
 
 ### But why?
-If you host an Arma 3 Server with lots of AI in it, the Server FPS will drop fast.
-Since the server files are only 32 Bit you will need some kind of magical assistant to prevent slow AI.
+If you host an Arma 3 Server with lots of AI in it, the Server FPS will drop fast. The headless client helps alleviate the AI's stress on the server.
 
-### Minimum RAM warning
-This server requires about 2048m to run properly. ARMA 3 is more CPU intensive though.
+### Installation Requirements
+- A valid, real Steam account, with Steam Guard turned off, is required to install the client (default "anonymous" login cannot be used). For security reasons it is recommended that you create a new Steam account just for your dedicated servers. This account *does not* need to own Arma 3.
+- The Arma 3 server this client is connecting to **must** be running a properly written mission file that accepts and utilizes headless clients. If you want to know how to implement, take a look at the Wiki [here](https://community.bistudio.com/wiki/Arma_3_Headless_Client#Spawning_the_AI) or at a guide in the A3 Forums [here](https://forums.bohemia.net/forums/topic/178434-arma3-headless-client-guide/).
+- For automatic Steam Workshop mod downloading to work, the Steam account *does* need to own Arma 3. This is, of course, optional functionality, and mods can be manually uploaded to the client if desired.
 
-### Additional settings
-Additional server flags can be found [here](https://community.bistudio.com/wiki/Arma_3_Startup_Parameters).  
-This can help is you see the server using to many cores/threads on the server.
-If you want to know how to implement, take a look at the Wiki [here](https://community.bistudio.com/wiki/Arma_3_Headless_Client#Spawning_the_AI) or at a guide in the A3 Forums [here](https://forums.bohemia.net/forums/topic/178434-arma3-headless-client-guide/).
+### Minimum RAM Warning
+This client requires about 2048 MB to run properly.
+
+### Additional Settings
+Additional client flags can be found [here](https://community.bistudio.com/wiki/Arma_3_Startup_Parameters).  
+These can help you fine tune how the client will behave during runtime.
+
+*Note: The `-maxMem=` flag is currently known to cause an unknown segmentaion fault crash on startup. Other hardware related flags may cause similar behavior.*
 
 ### Server Ports
-Since this is basically a client, this Egg does not need a port. 
+Since this is basically a client, this Egg does not need a port.
+Therefore, the port assigned to this Egg goes unused.