Update README

please add the requirement to compile
 root@lamp tmp/flashphoner_client# ./build.sh
./build.sh: line 1: #!/bin/sh: No such file or directory
./builder.sh: line 1: #!/bin/sh: No such file or directory
DETECTING java command...
- Java command found successfully.

DETECTING JVM architecture...
- 64-Bit architecture detected successfully.

DETECTING JDK home...
- JDK home detected successfully: /usr/java/default.

DETECTING ANT...
- ANT detected successfully.

Start clients build...
Error. Build api was not created
root@lamp tmp/flashphoner_client#