feat:add readme file

README.md

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+# Read Temperature Sensor Data on Raspberry Pi Pico
+
+## Prerequisites
+
+Before diving into code, you need to **install prerequisites**. You can see it from [here](INSTALLATION.md)
+
+## The Code
+
+The code below initializes the internal temperature sensor and UART, prepares them for use. The while loop read data from sensor and write it to the UART once per seconds.
+
+```c++
+int main() {
+
+    UART_Init();
+    TEMPERATURE_Init();
+
+    while (1) {
+
+        uint8_t ui8TemperatureCelsius = TEMPERATURE_Read();
+
+        UART_PutString(ui8TemperatureCelsius);
+        UART_PutChar('\n');
+
+        sleep_ms(1000);
+    }
+
+}
+```
+
+## Compiling The Code
+
+To compile the source code we need to create a CMake file to automate the process. CMake files allow us to  easily build source files into one easy to use file.
+
+Firstly we need to create folder that name is build.
+
+```console
+mkdir build
+cd build
+```
+
+Then, we need to import essential pico-sdk-libraries
+
+```console
+cmake ..
+```
+
+Now, we can compile source files
+
+```console
+cd ..
+cmake --build build
+```
+
+## Uploading The Code
+
+Now that we compiled the code we can deploy to our microcontroller.
+
+> **Note !:** To upload the compiled code, you need to start your Raspberry Pi Pico in **flash mode**. To start in flash mode you need to press **bootsel button** before plug in cable.
+
+```console
+cp build/main.ef2 <your-rasp-pi-pico-path>
+```