projects/ad5758_sdz: Add README.md files (#1672)

Signed-off-by: Elena-Hadarau_adi <Elena.Hadarau@analog.com>

Author: hadarauelena

projects/ad5758_sdz/README.md

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+# AD5758-SDZ HDL Project
+
+- Evaluation board product page: [EVAL-AD5758-SDZ](https://www.analog.com/eval-ad5758)
+- System documentation: https://wiki.analog.com/resources/eval/user-guides/ad5758
+- HDL project documentation: https://analogdevicesinc.github.io/hdl/projects/ad5758_sdz/index.html
+
+## Supported parts
+
+| Part name                                      | Description                                                                                            |
+|------------------------------------------------|--------------------------------------------------------------------------------------------------------|
+| [AD5758](https://www.analog.com/ad5758)        | Single-Channel, 16-Bit Current and Voltage Output DAC with Dynamic Power Control and HART Connectivity |
+
+## Building the project
+
+Please enter the folder for the FPGA carrier you want to use and read the README.md.

projects/ad5758_sdz/Readme.md

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+# AD5758-SDZ/ZED HDL Project
+
+## Building the project
+
+```
+cd projects/ad5758_sdz/zed
+make
+```
+
+Corresponding Linux device driver: [ad5758.c](https://github.com/analogdevicesinc/linux/blob/main/drivers/iio/dac/ad5758.c)
+
+Corresponding device tree documentation: [adi,ad5758.yaml](https://github.com/analogdevicesinc/linux/blob/main/Documentation/devicetree/bindings/iio/dac/adi%2Cad5758.yaml)