Update README.md

Added build and install instructions.
Update README.md

Fixing README.md
- Bug fix: EMP tower will now correctly activate when receiving a redstone signal
- Bug fix: Radar station will now actually show players who have a Signal Disrupter, if the Disrupter is out of power.
- Bug fix: Signal Disrupter, Radar Gun, Defuser and Laser Designator will now correctly charge on most MJ/RF chargers.
- Bug fix: Due to previous bug fix, the Rocket Launcher recipe is now functional(Requires fully charged Radar Gun).
- Change: To fix the charging bug I had to scale up the max energy for the items, and also scale the cost accordingly. They still have the same amount of uses before needing to recharge.
The values are now:
Radar gun: 1MJ and 80 uses
Laser designator: 10MJ and 10 uses
Defuser: 1MJ and 10 uses
Signal Disruptor: 1MJ and 80000 ticks duration(~1 hour, 6 minutes)
Merge branch 'master' of https://github.com/wildex999/ICBM