Create README.md

Author: Matthew Mirus

README.md

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+# gravityforms-regex-validation
+Add regular expression validation options to Gravity Forms single line text input.
+
+Use regular expressions to validate data entered in the single line text input type.
+
+To use:
+
+1. Add your single line text input.
+2. On the Advanced field settings tab, check "Use Regular Expression Validation"
+3. Enter your RegEx pattern in the "RegEx Pattern" field.
+4. Optionally, enter a custom validation message.
+
+Example:
+
+RegEx Pattern: ^1[0-9]{1}$
+Validation Message: Please enter a number between 10-19 (inclusive).