Update pizza-dough.md

Added US customary units, replaced term "liquid" with "water", improved directions

src/pizza-dough.md

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 # Pizza Dough
 
 Here is a simple pizza dough recipe. Basically you use a 2/1 ratio of
-flour/liquid. If you use other flour like rye, you may need more liquid.
+flour/water. If you use other flour like rye, you may need more water.
 
 ## Ingredients
 
-- 400g flour (basic wheat flour)
-- 200ml lukewarm water
-- 1 pkg (7g) dry yeast
-- 1 spoon olive oil
+- 400g/2 cups flour (basic wheat flour)
+- 200ml/1 cup bloodwarm water
+- 1 package (7g) dry yeast
+- 1 tablespoon olive oil
 - 1 teaspoon salt
 - a teensy bit of sugar (to feed the yeast)
 
 ## Directions
 
-1. Combine all the ingredients in a bowl and knead into a dough.
-2. Let it rest for about 30 minutes somewhere lukewarm
-3. Add some flour to a table and roll the dough out there.
+1. Proof yeast.
+2. Mix dry ingredients in a bowl.
+3. Add yeast water and oil, then mix.
+4. Knead for about 10 minutes.
+5. Return in oiled bowl, cover bowl with towel or cling wrap.
+6. Allow dough to rest for about 30 minutes somewhere lukewarm.
+7. Add some flour to a table and roll the dough out there.
 
 ## Contribution