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Part 3: Sign-up form The idea is the same as part 2. Students must: Have a form that contains at least 2 input fields: usemame and password. The error message or success message are hidden before the user click submit buttons. You should apply some rules for the format of either usemame or password. o You can search google for the pattem you'd like to have on your website o User preg_match() function to match the pattem and the form data There should be messages: o Error message for empty field. o Error message if there is invalid usemame password o Ifthere is no error, display a success message saying that the user signed up successfully. If the new account is valid, append the new account to the database: o Read the json file and decode to an associative array. o Use function array_push to append the new account to the array. NOTE: the new account should be in a small array with the same structure as the decoded array. o Use function file put contents() to write the new json string into the original file