added spicy mayo recipe (#520)

src/spicy-mayo.md

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+# Spicy Mayo
+
+A simple sauce that is at almost every sushi bar in the United States.
+
+- ⏲️ Prep time: 3 min
+
+## Ingredients
+
+- chili sauce (e.g Sriracha)
+- mayonnaise
+- sesame oil
+
+## Directions
+
+1. Add 2 parts mayonnaise to 1 part chili sauce in a bowl.
+2. Add 1 tbsp of sesame oil for every cup of mayonnaise you use.
+3. Mix all of the ingredients together, and taste test it for more chili sauce or mayonnaise.
+
+## Note
+
+This is just a basic guide, adapt this recipe to your liking.
+
+## Contribution
+
+- scary90
+
+;tags: basic sauce japanese