chore: add README and images

Signed-off-by: Aditya Agarwal <aditya.agarwal030504@gmail.com>

README.md

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+# Load BMP Image from SD Card And Display It On a 3.5" LCD Touchscreen With Arduino UNO R3/R4
+
+![GitHub License](https://img.shields.io/github/license/Aditya-A-garwal/Arduino-TFT-3-5-SDCard-BMP)
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+
+## Overview
+
+This repository contains a program to load a BMP Image from an SD Card and display it on a 3.5" touch screen display shield with an Arduino UNO R3/R4, as shown below -
+
+|![Image of LCD Touch Shield from Top](images/LCD_top.png)|![Image of LCD Touch Shield from Bottom](images/LCD_bottom.png)|
+|-|-|
+
+Most 3.5" LCD Touch displays use the ILI9486 Display Driver and include a resistive touchscreen. **The PCB Layout & silkscreen text may vary slightly between displays. This does not change their behaviour and functionality.** This repository depends on the following libraries -
+
+- [Adafruit Touch Screen Library](https://github.com/adafruit/Adafruit_TouchScreen) to manage touch input
+- [Adafruit GFX Library](https://github.com/adafruit/Adafruit-GFX-Library/tree/master) for graphics primitives
+- [This fork of the MCUFriend KBV library](https://github.com/slviajero/MCUFRIEND_kbv) to drive the display (this makes it compatible with the UNO R4)
+
+The program has been written using PlatformIO, and has been tested on the [Arduino UNO R3](https://docs.arduino.cc/hardware/uno-rev3/), [Arduino UNO R4 Minima](https://docs.arduino.cc/hardware/uno-r4-minima/) & [Arduino UNO R4 WiFi](https://docs.arduino.cc/hardware/uno-r4-wifi/).
+
+The loadBMP, read16 and read32 functions in [```src/main.cpp```](/src/main.cpp) have been taken from [this example in the MCUFRIEND repository](https://github.com/prenticedavid/MCUFRIEND_kbv/blob/master/examples/showBMP_kbv_Uno/showBMP_kbv_Uno.ino), for fair use and educational purposes. All code taken from other repositories belongs to their respective authors and are protected by their respective licenses.
+
+## Building/Uploading With PlatformIO
+
+Since this project has been written using PlatformIO by default, simply run the following commands to fetch the libraries, build the project and upload the program -
+
+```shell
+pio pkg install
+pio run
+pio run --target upload
+```
+
+## Building/Uploading With Arduino IDE
+
+Create a new sketch and copy the contents of [```src/main.cpp```](/src/main.cpp) from this repository into the default ```.ino``` file. Create a new tab/file in the IDE named ```constants.h``` and copy the contents of [```src/constants.h```](/src/main.cpp) from this repository into this file.
+
+Install the Adafruit Touch Screen Library and Adafruit GFX Library from the Library Manager (under *Sketch>Include Library>Manage Libraries...*)
+
+Download [this](https://github.com/slviajero/MCUFRIEND_kbv) repository as a ZIP file and install it by navigating to *Sketch>Include Library>Add .ZIP Library*, and selecting the downloaded file from the file explorer.
+
+After this, you can Build and Upload the program as usual.
+
+
+## Using the Example
+
+Format an SD Card with a FAT32 filesystem with a single drive. Load a BMP Image whose dimensions are under 320x480 into the SD Card and plug the SD Card into the slot situated on the back of the display. A [BMP Image File](/example.bmp) is included in the repository in case one is not immediately available.
+
+As soon as the program is uploaded, the display should turn red and the image should be slowly painted on the display, starting from the top-left corner.
+
+## Troubleshooting
+
+Some common problems and their solutions -
+
+|Problem|Solution|
+|-|-|
+|Display stays white after uploading program|Non-Standard Driver (not ILI9486)|
+|Display not responding after touch|Try changing the order of the touch pins in ```src/constants.h``` file, i.e. swap the values of ```XP```, ```YP```, ```XM``` and ```YM```|
+|Compilation issues related to SPI|Update the Arduino IDE version and/or install the SPI library|
+|Display Flickering/Arduino is reset automatically|Faulty Power Supply/Cable|
+