ad7616: Update README

Signed-off-by: Stanca Pop <[email protected]>

Author: StancaPop

projects/ad7616_sdz/README.md

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+# AD7616-SDZ HDL Project
+
+- Evaluation board product page: [EVAL-AD7616](https://www.analog.com/eval-ad7616)
+- System documentation: https://wiki.analog.com/resources/eval/user-guides/ad7616-sdz
+- HDL project documentation: http://analogdevicesinc.github.io/hdl/projects/ad7616_sdz/index.html
+
+## Supported parts
+
+| Part name                                      | Description                                                  |
+|------------------------------------------------|--------------------------------------------------------------|
+| [AD7616](https://www.analog.com/ad7616)        | 16-Channel DAS with 16-Bit, Bipolar Input, Dual Simultaneous Sampling ADC |
+
+## Building the project
+
+Please enter the folder for the FPGA carrier you want to use and read the README.md.

projects/ad7616_sdz/Readme.md

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+# Ed7616-SDZ/Zed HDL Project
+
+## Building the project
+
+The parameter configurable through the `make` command, can be found below, as well as in the **system_project.tcl** file; it contains the default configuration.
+
+```
+cd projects/ad7616_sdz/zed
+make
+```
+
+The overwritable parameter from the environment:
+
+- INTF - specifies the interface to be used; 
+  - 0 - Parallel interface
+  - 1 - Serial interface
+
+Depending on the required interface mode, some hardware modifications need to be done.
+  - SL5 - unmounted - Parallel interface
+  - SL5 - mounted - Serial interface
+Note: This switch is a hardware switch. Please rebuild the design if the variable has been changed.
+
+### Example configurations
+
+#### Parallel interface (default)
+
+This specific command is equivalent to running `make` only:
+
+```
+make INTF=0
+```
+
+#### Serial interface
+
+This specific command is equivalent to running `make` only:
+
+```
+make INTF=1
+```
+
+Corresponding No-OS project for both configurations:
+
+- [ad7616-sdz](https://github.com/analogdevicesinc/no-OS/tree/main/projects/ad7616-sdz)