Added vegetarian zucchini+corn taco recipe

full_tacos/zucchini_corn_tacos.md

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+Zucchini and Corn Tacos
+===================================
+
+Vegetarian; vegan without cheese
+-----------------------------------------
+
+* Diced zucchini
+* White or yellow corn kernels
+* Chopped white onion
+* Chopped tomatoes
+* Finely chopped garlic
+* Black beans (you can even use [Garlic Black Beans](/base_layers/garlic_black_beans.md))
+* Finely chopped oregano or epazote
+
+1. Toast corn in a skillet over high heat with oil and salt for about 5 minutes.  Remove corn.
+2. Cook onion in the skillet until it caramelizes (about 5 minutes).  Leave onion in there.
+3. Add garlic, cook another 1 or 2 minutes.
+4. Add diced tomatoes, cook for 8-10 minutes.
+5. Add zucchini, cook until it's tender.
+6. Add corn back in.
+7. Add black beans, epazote; add salt, pepper, and other seasonings to taste.  Cook for 3-4 more minutes.
+8. Serve in corn tortillas, topped with optional cheese (queso fresco if possible) and salsa (tomatillo is best).