[ATL-1533] Firmware&Certificate Uploader (#469)

Co-authored-by: Alberto Iannaccone <a.iannaccone@arduino.cc>

arduino-ide-extension/src/browser/dialogs/certificate-uploader/certificate-add-new.tsx

@@ -0,0 +1,37 @@
+import * as React from 'react';
+
+export const CertificateAddComponent = ({
+  addCertificate,
+}: {
+  addCertificate: (cert: string) => void;
+}): React.ReactElement => {
+  const [value, setValue] = React.useState('');
+
+  const handleChange = React.useCallback((event) => {
+    setValue(event.target.value);
+  }, []);
+
+  return (
+    <form
+      className="certificate-add"
+      onSubmit={(event) => {
+        event.preventDefault();
+        event.stopPropagation();
+        addCertificate(value);
+        setValue('');
+      }}
+    >
+      <label>
+        <div>Add URL to fetch SSL certificate</div>
+        <input
+          className="theia-input"
+          placeholder="Enter URL"
+          type="text"
+          name="add"
+          onChange={handleChange}
+          value={value}
+        />
+      </label>
+    </form>
+  );
+};