CONTRIBUTING: initial documentation

Signed-off-by: Philip Molloy <[email protected]>

CONTRIBUTING.md

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+When contributing to Precision Converters Firmware please consider the
+following checklist:
+
+- [ ] Copyright header has been added to source and header files
+- [ ] Artistic Style (`astyle`) has been run to lint new code
+  ```
+  astyle --options=../no-OS/ci/astyle_config \
+         projects/foobar/app/*.c \
+         projects/foobar/app/*.h
+  ```
+- [ ] Add EEPROM validation code
+- [ ] Add all context attributes (e.g. `fw_version`, `hw_carrier`,
+      `hw_mezzanine`, `hw_name`, `hw_mezzanine_status`)
+- [ ] IIO attributes in the firmware match the corresponding Linux driver
+      attributes
+- [ ] Create a `readme.md` in the project directory explaining how to use the
+      project
+
+- [ ] Validate EEPROM detection and context attributes creation using IIO
+      clients (e.g. ACE, IIO Oscilloscope)
+- [ ] Capture and verify ADC data using an IIO client
+- [ ] Test on the target platform with `USE_SDRAM` and `NO_SDRAM` where applicable
+- [ ] Test on the target platform with physical and virtual serial ports where
+      applicable
+- [ ] Test using the STM32 HAL where applicable
+- [ ] Validate attributes, calibration, temperature sensing, etc using a client
+
+- [ ] Update corresponding ADI Wiki pages
+- [ ] Request links to those pages on the product page
+
+- [ ] Open a pull request on Github