Create README.md

Author: povauboin

README.md

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+# efx-jtag-spi-flash-loader
+Efinix JTAG SPI Flash loader proxy bitstream
+
+### Build proxy bitstream
+Open the project in efinity and build.
+
+### Load the proxy bitstream
+Assuming your are using a FT4232 with JTAG on bus A.
+```
+source /opt/efinity/2022.2/bin/setup.sh
+
+/opt/efinity/2022.2/bin/python3 /opt/efinity/2022.2/pgm/bin/efx_pgm/ftdi_program.py -m jtag -a "ftdi://0x0403:0x6011/1" outflow/efx_jtag_spi_flash_loader.hex
+```
+
+### Flash your application bitstream
+```
+/opt/efinity/2022.2/bin/python3 /opt/efinity/2022.2/pgm/bin/efx_pgm/ftdi_program.py -m jtag_bridge -a "ftdi://0x0403:0x6011/1" path_to_my_bitstream.hex
+```