projects/ad9213_evb: Updated README files

Signed-off-by: Cristian Mihai Popa <[email protected]>

Author: cristianmihaipopa

projects/ad9213_evb/README.md

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+# AD9213-EVB HDL Project
+
+- Evaluation board product page: [EVAL-AD213](https://www.analog.com/eval-ad9213)
+- System documentation: TO BE ADDED
+- HDL project documentation: https://analogdevicesinc.github.io/hdl/projects/ad9213_evb/index.html
+
+## Supported parts
+
+| Part name                                                | Description                                                  |
+|----------------------------------------------------------|--------------------------------------------------------------|
+| [AD9213](https://www.analog.com/en/products/ad9213.html) | 12-Bit, 10.25 GSPS, JESD204B, RF Analog-to-Digital Converter |
+
+## Building the project
+
+Please enter the folder for the FPGA carrier you want to use and read the README.md.

projects/ad9213_evb/Readme.md

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+# EVAL-AD9213/VCU118 HDL Project
+
+## Building the project
+
+The parameters configurable through the `make` command, can be found below, as well as in the **common/ad9213_evb_bd.tcl** file; it contains the default configuration.
+
+```
+cd projects/ad9213_evb/vcu118
+make
+```
+
+All of the RX link modes can be found in the [AD9213 data sheet](https://www.analog.com/media/en/technical-documentation/data-sheets/AD9213.pdf). We offer support for only a few of them.
+
+If other configurations are desired, then the parameters from the HDL project (see below) need to be changed, as well as the Linux/no-OS project configurations.
+
+The overwritable parameters from the environment:
+
+- RX_NUM_OF_CONVERTERS - RX number of converters per link
+- RX_NUM_OF_LANES - RX number of lanes per link
+- RX_SAMPLES_PER_FRAME - RX number of samples per converter per frame
+- RX_JESD_NP - RX number of bits per sample, only 16 is supported
+- RX_SAMPLE_WIDTH - RX data width
+
+### Example configurations
+
+#### Default configuration:
+
+This specific command is equivalent to running `make` only:
+
+```
+make RX_NUM_OF_LANES=16 RX_NUM_OF_CONVERTERS=1 RX_SAMPLES_PER_FRAME=16 RX_SAMPLE_WIDTH=16
+```