pulsar_lvds_adc: Update README

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

Author: StancaPop

projects/pulsar_lvds_adc/README.md

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+# PULSAR-LVDS-ADC HDL Project
+ 
+- Evaluation boards product page:
+  - [EVAL-AD7625](https://www.analog.com/eval-ad7625)
+  - [EVAL-AD7626](https://www.analog.com/eval-ad7626)
+  - [EVAL-AD7960](https://www.analog.com/eval-ad7960)
+  - [EVAL-AD7961](https://www.analog.com/eval-ad7961)
+- System documentation: TO BE ADDED
+- HDL project documentation: http://analogdevicesinc.github.io/hdl/projects/pulsar_lvds_adc/index.html
+ 
+## Supported parts
+
+| Part name                               | Description                                      |
+|-----------------------------------------|--------------------------------------------------|
+| [AD7625](https://www.analog.com/ad7625) | 16-Bit, 6MSPS PulSAR Differential ADC |
+| [AD7626](https://www.analog.com/ad7626) | 16-Bit, 10 MSPS, PulSAR Differential ADC |
+| [AD7960](https://www.analog.com/ad7960) | 18-Bit, 5 MSPS PULSAR Differential ADC |
+| [AD7961](https://www.analog.com/ad7961) | 16-Bit, 5 MSPS PULSAR Differential ADC |
+
+## Building the project
+
+Please enter the folder for the FPGA carrier you want to use and read the README.md.

projects/pulsar_lvds_adc/Readme.md

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+# PULSAR_LVDS_ADC/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/pulsar_lvds_adc/zed
+make
+```
+
+The overwritable parameter from the environment:
+ 
+- RESOLUTION_16_18N - defines the resolution of the ADC (16 or 18 bits); 
+  - 0 - 16 bits
+  - 1 - 18 bits
+
+### Example configurations
+
+#### 16-bit resolution (default) - corresponding to AD7960
+ 
+This specific command is equivalent to running `make` only:
+
+```
+make RESOLUTION_16_18N=0
+```
+
+#### 18-bit resolution - corresponding to AD7625/AD7626/AD7961
+
+```
+make RESOLUTION_16_18N=1
+```   
+
+Corresponding No-OS project: [ad796x_fmcz](https://github.com/analogdevicesinc/no-OS/tree/main/projects/ad796x_fmcz)
+
+Corresponding Linux driver: [ad7625.c](https://github.com/analogdevicesinc/linux/blob/main/drivers/iio/adc/ad7625.c)