Added a README file.

README.md

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+# MAX6675 Thermocouple Library
+
+For Arduino boards.
+
+The Library implements a set of methods for working with a thermocouple based on the MAX6675 driver.
+Provides a temperature reading in Celsius, Fahrenheit and Kelvin.
+
+## Installation
+
+1. [Download](https://github.com/YuriiSalimov/MAX6675_Thermocouple/releases) the Latest release from gitHub.
+2. Unzip and modify the Folder name to "MAX6675_Thermocouple" (Remove the '-version')
+3. Paste the modified folder on your Library folder 
+(On your `libraries` folder inside Sketchbooks or Arduino software).
+4. Restart the Arduino IDE.
+
+## Circuit Diagram
+
+![Circuit Diagram](MAX6675_K_Type_Thermocouple.png)
+
+## Methods
+
+```
+    /**
+        SCK_PIN - SCK digital port number.
+        CS_PIN - CS digital port number.
+        SO_PIN - SO digital port number.
+    */
+    MAX6675_Thermocouple thermocouple(SCK_PIN, CS_PIN, SO_PIN);
+    
+    // Read a temperature in Celsius.
+    thermocouple.readCelsius();
+    
+    // Read a temperature in Kelvin.
+    thermocouple.readKelvin();
+	
+    // Read a temperature in Fahrenheit.
+    thermocouple.readFahrenheit();
+    // For older devices.
+    thermocouple.readFarenheit();
+```
+
+Created by Yurii Salimov.