Create README.md

Author: SpencerCurtis

README.md

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+# Swift Fundamentals III Module Project
+
+The goal of today's module project is to create a Currency Conversion playground that can convert from US dollars (USD) to Canadian dollars (CAD) and Mexican Pesos (MXN).
+
+Get the currency conversion value from Google:
+
+On August 7th, 2019 they were:
+
+	$1 USD to $1.33 CAD
+	$1 USD to $19.70 MXN
+
+## Add the Conversion Logic
+
+1. Create a currency type enum above the class and below the `import` statements.
+
+	```swift
+	enum Currency {
+	    case cad
+	    case mxn
+	}
+	```
+
+2. Create a property named `currency` of type `Currency`. This will store the current currency type we'll be converting to. Set an initial value of `.cad`.
+3. Create a helper method to calculate the currency based on the Currency using the method signature:
+	```swift
+	func convert(_ dollars: Double) -> Double {
+	
+	}
+	```
+4. In the above method:
+    * Check the value of `currency` to see whether you should convert to CAD or MXN
+    * Perform the conversion with the dollars passed into this method
+    * Return the converted value
+5. Create a function called `convert(amountString: String)` In it, do the following:
+    * create a constant called `amount`. Its value should be the `amountString` that is initialized into a `Double`
+    * use a `guard let` to unwrap the new `amount` constant.
+    * convert the dollar amount to the expected currency (hint, you'll want to call the `convert` method you created in step 3)
+    * Update the `toCurrencyTextField.text` property with the converted currency value
+
+## Go Further (Optional)
+
+1. Customize the output using a `NumberFormatter`
+
+	```swift
+	var currencyFormatter: NumberFormatter = {
+	    let formatter = NumberFormatter()
+	    formatter.numberStyle = .currency
+	    return formatter
+	}()
+	```
+
+2. Use the `string(from:)` method to convert from a number to a String for display
+
+