Add README

Author: MRNIU

src/README.md

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+= Keyboard Library for Arduino =
+
+This library allows an Arduino board with USB capabilities to act as a Keyboard.
+
+For more information about this library please visit us at
+https://www.arduino.cc/reference/en/language/functions/usb/keyboard/
+
+= Contributors =
+
+Original code (pre-library): Peter Barrett
+
+Contributor: MRNIU
+
+= Usage =
+
+See examples/Serial/Serial.ino
+
+== License ==
+
+Copyright (c) Arduino LLC. All right reserved.
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA