Wire up the filters form

up the filter form fields as controlled elements, … that update some new state variables … tracking their contents. … So as of now, I can type in these and nothing happens. … We're going to change these so they are controlled. … So first, we know we're going to need to track some new state. … We're going to need to track the currently typed in name, … the currently selected title and whether … We'll add a key called current name … which will start out empty. … Likewise the current title, also empty. … And we'll use isIntern to track whether … that checkbox is checked, and that will start as false. … So these are the pieces of state we have … at the Directory level, and we'll pass these … into the filters as props. … We're keeping the state here at the Directory level … because these are all going to influence each other. … Seems like the right place for now. … So we'll pass these all in currentName equals … this.state.currentName, currentTitle is … this.state.currentTitle. … We'll also pass in isIntern this.state.isIntern. …