added banana green smoothie recipe

src/banana-green-smoothie.md

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+# Banana Green Smoothie
+
+## Ingredients
+
+- 2 cups baby spinach leaves, or to taste
+- 1 banana
+- 1 carrot, peeled and cut into large chunks
+- 3/4 cup plain fat-free Greek yogurt, or to taste
+- 3/4 cup ice
+- 2 tablespoons honey
+
+## Directions
+
+1. Put spinach, banana, carrot, yogurt, ice, and honey in a blender; blend until smooth.
+
+## Contribution
+
+Front3ndNinja - [Website](https://github.com/Front3ndNinja)
+
+;tags: drink sweet breakfast