added kale banana smoothie recipe

src/kale-banana-smoothie.md

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+# Kale Banana Smoothie
+
+- ⏲️ Prep time: 10 min
+- 🍳Cook time: 10 min
+- 🍽️ Servings: 1
+
+## Ingredients
+
+- 16 fluid ounces coconut water, chilled
+- 1 banana
+- 1/2 avocado, peeled and pitted
+- 1/2 cup packed kale
+- 1/2 lemon, juiced
+- 1 pinch cayenne pepper
+
+## Directions
+
+1. Put coconut water, banana, avocado, kale, lemon juice, and cayenne pepper in blender; blend until smooth, about 30 seconds.
+
+## Contribution
+
+Front3ndNinja - [Website](https://github.com/Front3ndNinja)
+
+;tags: drink sweet breakfast