added gloomy day smoothie recipe

src/gloomy-day-smoothie.md

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+# Gloomy Day Smoothie
+
+## Ingredients
+
+- 1 mango - peeled, seeded, and cut into chunks
+- 1 banana, peeled and chopped
+- 1 cup orange juice
+- 1 cup vanilla nonfat yogurt
+
+## Directions
+
+1. Place mango, banana, orange juice, and yogurt in a blender. Blend until smooth. Serve in clear glasses, and drink with a bendy straw!
+
+## Contribution
+
+Front3ndNinja - [Website](https://github.com/Front3ndNinja)
+
+;tags: drink sweet breakfast