Document use of pins for motor control experimental designs.

Signed-off-by: Pavel Pisa <ppisa@pikron.com>

diff --git a/doc/rpi_gpio_use.md b/doc/rpi_gpio_use.md
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+RPi and rpi-mc-1 Board Pins
+===========================
+
+| RPi GPIO | Pin no. | Simple-dc | PMSM SPI | PMSM AM | RPI JTAG |
+| -------- | ------- | --------- | -------- | ------- |--------- |
+| +3.3v    | 1       |           |          |         |          |
+| +5v      | 2       |           |          |         |          |
+| gpio2    | 3       |           |          |         |          |
+| +5v      | 4       |           |          |         |          |
+| gpio3    | 5       |           |          |         |          |
+| GND      | 6       |           |          |         |          |
+| gpio4    | 7       |           | gpio_clk | gpio_clk| TDI      |
+| gpio14   | 8       |           |          |         | RxD      |
+| GND      | 9       |           |          |         |          |
+| gpio15   | 10      |           |          |         | TxD      |
+| gpio17   | 11      |           |          |         |          |
+| gpio18   | 12      | pwm_in    |          | pwm1    |          |
+| gpio27   | 13      |           |          |         | TMS      |
+| GND      | 14      |           |          |         |          |
+| gpio22   | 15      | pwm_dir_in|          | pwm1_en | TRST     |
+| gpio23   | 16      | irc_a     |          | irc_a   | RTCK     |
+| +3.3v    | 17      |           |          |         | TDO      |
+| gpio24   | 18      | irc_a     |          | irc_i   |          |
+| gpio10   | 19      |           | spi_mosi | spi_mosi|          |
+| GND      | 20      |           |          |         |          |
+| gpio9    | 21      |           | spi_miso | spi_miso|          |
+| gpio25   | 22      |           |          |         | TCK      |
+| gpio11   | 23      |           | spi_clk  | spi_clk |          |
+| gpio8    | 24      | irc_b     |          | irc_b   |          |
+| GND      | 25      |           |          |         |          |
+| gpio7    | 26      | irc_b     | spi_ce   | spi_ce  |          |
+| ID_SDA   | 27      |           |          |         |          |
+| ID_SCL   | 28      |           |          |         |          |
+| gpio5    | 29      |           |          |         |          |
+| GND      | 30      |           |          |         |          |
+| gpio6    | 31      |           |          |         |          |
+| gpio12   | 32      |           |          | pwm3    |          |
+| gpio13   | 33      |           |          | pwm2    |          |
+| GND      | 34      |           |          |         |          |
+| gpio19   | 35      |           |          | pwm2_en |          |
+| gpio16   | 36      |           |          |         |          |
+| gpio26   | 37      |           |          | pwm3_en |          |
+| gpio20   | 38      |           |          |         |          |
+| GND      | 39      |           |          |         |          |
+| gpio21   | 40      |           |          |         |          |
+