Add banana bread recipe

Signed-off-by: Alan Orth <alan.orth@gmail.com>

banana-bread.md

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+## Banana bread
+
+Originally from: http://www.simplyrecipes.com/recipes/banana_bread/
+
+### INGREDIENTS
+
+- 3 or 4 ripe bananas, smashed
+- 1/3 cup melted butter
+- 1 cup sugar (can easily reduce to 3/4 cup)
+- 1 egg, beaten
+- 1 teaspoon vanilla
+- 1 teaspoon baking soda
+- Pinch of salt
+- 1 1/2 cups of all-purpose flour
+- Handful of walnut pieces (optional)
+- Ground flax seed (optional)
+
+### METHOD
+
+No need for a mixer for this recipe. Preheat the oven to 350°F (175°C). With a wooden spoon, mix butter into the mashed bananas in a large mixing bowl. Mix in the sugar, egg, and vanilla. Sprinkle the baking soda and salt over the mixture and mix in. Add the flour last, mix. Pour mixture into a buttered 4x8 inch loaf pan. Bake for 1 hour. Cool on a rack. Remove from pan and slice to serve.