Create top-level schematics.
Add first sheet entry.

Made an sheet entry and connect a harness signal on the MCU and FPGA.
Connect usb_data and usb_power to MCU
Connect video output. Create proxy harness.

Most of the harnes so far is just proxy harness, need to rename them in
later time.
Create 2nd SRAM, connect SRAM  and serial.
Add text to schematics info.
Merge pull request #12 from dmpro2014/top-level-schematics

Top level schematics