Add a cake and frosting recipe

cake-recipe.txt

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+Ingredients:
+ - 2 cups sugar
+ - 1 3/4 cups all-purpose flour
+ - 3/4 cup cocoa
+ - 1 1/2 teaspoons baking powder
+ - 1 1/2 teaspoons baking soda
+ - 1 teaspoon salt
+ - 2 eggs
+ - 1 cup milk
+ - 1/2 cup vegetable oil
+ - 2 teaspoons vanilla extract
+ - 1 cup boiling water
+
+Directions:
+ 1. Preheat oven to 350 degrees F. Grease and flour two 9-inch round baking
+    pans.
+
+ 2. In a large bowl, combine the sugar, flour, cocoa, baking powder, baking soda
+    and salt.  Add eggs, milk, oil and vanilla. Mix until smooth.  Stir in
+    boiling water (batter will be thin). Pour batter into prepared pans.
+
+ 3. Bake 30 to 35 minutes or until a toothpick inserted in the center comes out
+    clean. Cool completely.
+

frosting-recipe.txt

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+Ingredients:
+ - 1/2 cup butter
+ - 2/3 cup cocoa
+ - 3 cups powdered sugar
+ - 1/3 cup milk
+ - 1 teaspoon vanilla extract
+
+Directions:
+  1. In a medium saucepan, melt butter and stir in cocoa.
+  2. Alternately add powdered sugar and milk. Beat until light and fluffy.
+  3. Stir in vanilla.  If necessary, add a small amount of additional milk.