Update README.md

Add explanation to README about setting the "fazecast.jSerialComm.appid" property in order to eliminate problems related to using the lib from multiple apps.
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@ -7,6 +7,13 @@ _A platform-independent serial port access library for Java._
For usage examples, please refer to the [Usage wiki](https://github.com/Fazecast/jSerialComm/wiki/Usage-Examples).
If you intend to use the library in multiple applications simultaneously, please make sure
to set ```fazecast.jSerialComm.appid``` property before accessing the SerialPort class so that
applications don't accidentally delete each others temporary files during boot-up:
```
System.setProperty("fazecast.jSerialComm.appid", "YOUR_APPLICATION_IDENTIFIER")
```
In order to use the ```jSerialComm``` library in your own project, you must simply
include the JAR file in your build path and import it like any other
Java package using ```import com.fazecast.jSerialComm.*;```.