docs: Adding details for various supported devices.

Each type of device includes;
 - General device description
 - Details about the spice model and operating conditions.
 - Images of the symbols for the device.
 - Image showing the cross-section of the device.

The devices included are;
 - Bipolar (NPN)
 - Bipolar (PNP)
 - MiM Capacitor
 - Vertical Parallel Plate (VPP) capacitors
 - SONOS cells
 - SRAM cells
 - Diodes
 - 11V/16V NMOS FET
 - 1.8V NMOS FET
 - 1.8V low-VT NMOS FET
 - 20V NMOS FET
 - 20V isolated NMOS FET
 - 20V native NMOS FET
 - 20V NMOS zero-VT FET
 - 3.0V and 5.0V native NMOS FET
 - 5.0V/10.5V NMOS FET
 - NMOS ESD FET
 - 10V/16V PMOS FET
 - 1.8V PMOS FET
 - 1.8V high-VT PMOS FET
 - 1.8V low-VT PMOS FET
 - 20V PMOS FET
 - 5.0V/10.5V PMOS FET
 - Generic Resistors
 - P- poly precision resistors
 - P+ poly precision resistors
 - Varactors

Signed-off-by: Tim 'mithro' Ansell <me@mith.ro>

Temp.
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