Add grid folder for first exercise and initial README.md draft

grid/01-grid-layout-1/README.md

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+# The Holy Grail Layout with Grid
+
+Now it's time to practice the Grid tools we've learned and create a layout that might seem familiar. We're going to make a Holy Grail Layout like the ones we created using Flexbox. The difference here is that we won't be relying on Flexbox for this exercise. We'll only be using Grid. You'll be able to see the benefits of Grid for yourself!
+
+### Hints
+
+## Desired Outcome
+
+### Self Check