add i2c page

diff --git a/shakti/m_class/i2c.mdwn b/shakti/m_class/i2c.mdwn
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+# I2C
+
+* <https://github.com/sifive/sifive-blocks/tree/master/src/main/scala/devices/>
+  includes GPIO, SPI, UART, JTAG, I2C, PinCtrl, UART and PWM.  Also included
+  is a Watchdog Timer and others.
+* <http://opencores.org/project,i2c_master_slave>
+