✨ added recipe for cupcake icing

Sweet/cupcakes_icing.md

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+## Ingredients
+* 140g butter
+* 280g powdered sugar
+* a few drops of your preferred food colouring (I suggest red for pink icing)
+* 1 table spoon milk
+
+## Materials
+* mixing bowl
+* piping bag
+
+## Instructions
+1. Beat the butter in the mixing bowl until it's creamy. Add half of the powdered sugar and stir.
+2. Add the rest of the powdered sugar together with the milk and beat it until it's creamy.
+3. Add the food colouring and mix it properly. If the texture is too fluid yet, add more powdered sugar until preferred texture.
+4. Add the icing to the cupcake base muffins with the help of a piping bag.
+5. Put all cupcakes into the fridge until consumption. Enjoy!