Temperature Unit Conversion [FEATURE] (#194)

Celsius to Fahrenheit and back

Co-authored-by: Angelos Chalaris <chalarangelo@gmail.com>

snippets/celsius_to_fahrenheit.md

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+---
+title: celsius_to_fahrenheit
+tags: math,beginner
+---
+
+Converts Celsius to Fahrenheit.
+
+Use the formula `fahrenheit = (celsius * 1.8) + 32` to convert from Celsius to Fahrenheit.
+
+```py
+def celsius_to_fahrenheit(celsius):
+  return ((celsius * 1.8) + 32)
+```
+
+```py
+celsius_to_fahrenheit(180) # 356.0
+```

snippets/fahrenheit_to_celsius.md

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+---
+title: fahrenheit_to_celsius
+tags: math,beginner
+---
+
+Converts Fahrenheit to Celsius.
+
+Use the formula `celsius = (fahrenheit - 32) / 1.8` to convert from Fahrenheit to Celsius.
+
+```py
+def fahrenheit_to_celsius(fahrenheit):
+  return ((fahrenheit - 32) / 1.8)
+```
+
+```py
+fahrenheit_to_celsius(77) # 25.0
+```