README added with image link and steps

README.md

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+# PYNQ on Zynq Board (zc702)
+
+
+### Directly use the image for running pynq on zc702:
+
+- Get the Image file from [Here](https://drive.google.com/file/d/1yqIqKBsLTee0bAPET0PcrAWoWAk6VIH9/view?usp=sharing)
+- Untar `ZC702-2.6.0.tar.xz`
+- flash the image to sd card using [balena etcher](https://www.balena.io/etcher/) or dd 
+<br>
+`sudo dd bs=1M if=<image-name>.img of=/dev/<sdcard>`
+- Insert the SDCARD into the board
+- **ON ZC702 keep SW16 boot config switch position: 00110**
+- You can login to the board accessing the serial port
+- [x] Solve the jupyter access issue.
+- [x] PYNQ-DPU port on zc702
+
+### Build the image with customized conf file:
+
+- create a `test_repo/ZC702` folder inside `<petalinux>/sdbuild`
+- The `test_repo/ZC702` should contain the ZC702 BSP file which can be downloaded from the xilinx site.
+- source the following things if not done already: 
+```
+export PATH="/opt/crosstool-ng/bin:/opt/qemu/bin:$PATH"
+source <path-to-vivado>/Vivado/2018.3/settings64.sh
+source <path-to-sdk>/SDK/2018.3/settings64.sh
+source <path-to-petalinux>/petalinux-v2018.3-final/settings.sh
+petalinux-util --webtalk off
+```
+
+- Create a file called `ZC702.spec` inside `test_repo/ZC702` and edit according to the build need. Following the file that I used for the img present in the repo:
+
+```
+ARCH_ZC702 = arm
+BSP_ZC702 = <bsp-name>.bsp
+STAGE4_PACKAGES_ZC702 = ethernet
+```
+
+- To build our more customised SD card image while still using the pre-built we can run
+`$ make BOARDDIR=test_repo PREBUILT=<recent-arm-image>.img nocheck_images`