projects/ad77681evb: Add README.md files

Signed-off-by: Elena-Hadarau_adi <[email protected]>

Author: hadarauelena

projects/ad77681evb/README.md

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+# AD77681-EVB HDL Project
+
+- Evaluation board product page: [EVAL-AD77681-EVB](https://www.analog.com/eval-ad7768-1)
+- System documentation: https://wiki.analog.com/resources/eval/user-guides/ad7768-1
+- HDL project documentation: https://analogdevicesinc.github.io/hdl/projects/ad77681evb/index.html
+
+## Supported parts
+
+| Part name                                      | Description                                                                     |
+|------------------------------------------------|---------------------------------------------------------------------------------|
+| [AD77681](https://www.analog.com/ad7768-1)     | DC to 204 kHz, Dynamic Signal Analysis, Precision 24-Bit ADC with Power Scaling |
+| [ADAQ77681](https://www.analog.com/adaq7768-1) | 24-Bit Single Channel Precision μModule Data Acquisition System                 |
+
+## Building the project
+
+Please enter the folder for the FPGA carrier you want to use and read the README.md.

projects/ad77681evb/Readme.md

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+# AD77681-EVB/ZED HDL Project
+
+## Building the project
+
+```
+cd projects/ad77681evb/zed
+make
+```
+
+Corresponding device tree: [zynq-zed-adv7511-ad7768-1-evb.dts](https://github.com/analogdevicesinc/linux/blob/main/arch/arm/boot/dts/xilinx/zynq-zed-adv7511-ad7768-1-evb.dts)