Create README.md

Author: arduino12

README.md

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+# rdm6300
+A simple library to interface with RDM6300 RFID reader.
+
+## Features
+* Fast and single tag reading, even if it held near the antenna for a while.
+* Using a single configurable GPIO pin.
+* Can tell if the tag is still near the antenna.
+
+## Getting Started
+
+### Hardware
+* RDM6300 module with matching antenna.
+* 125KHz RFID tags.
+* Microcontroller (arduino, esp8266, esp32...).
+* Jump-Wires (Resistors of 1K and 2K if you are using 3.3V based microcontroller).
+
+![alt text](https://lh3.googleusercontent.com/xaZxf4aRQCM8teJDho_jtRJmqZsE5Da2rX5pBThctffH6az2lyWtEnTPPcqcCPayg55p8bbobJLVRCW-M5e5ywGp2nlcUq1dZAzxXvzCjm2zXq0e8K1EeNI6WG2G_gApMI90Lkt_rYKPiamGgXwFvjGCE-rI2NmOciinfDIbdIpCHMlPf-0WRTxo7s7hSY86b0BDnNRpCKgZBeJizIM3karj6Y5EwH3xP5heDDr2sunw4YWF5EQCmVrU-ipS8Umzp5EnyQELH0nW9JfAXFHkN4aCVoO2QW2oOMRajGpEW8IGxAQUEmLHmYQEsqV1dUd4aVvkTFnN-H2JoOssspcIpXoHExpLLxOwlk2QjT6KVw7hQaeENwv-my6gEbTOzfg9DoC__j6WMkjewsaph408ALDsqxjm5lOoZDl9ag8nwqXi0SmmCphq7FiwG9pbyrTCbOqh4V8Dep4vXg3lkchZeedWLSU51xIJjN3K2RYG9tSiemIO4TjjNB_fEZiq5dbakNeSjKdyjjCUoKsWTOsrDlkBSpvC7U_2VcrU_4eExXkf8qyY_HPYD-X6QRodMqBzvQJUOlC_UIihDbZd8MUW0WMsGBCKAzVScL4msemZphtI4vhWAwNj4l1ss5P9hCkAdhpWPJkzz8hIYvBt3HLfxPv9NL0S12C1TKVNEGmu_PZkPvrk4j1I0hXwVA=w688-h578-no "rdm6300_connections")
+
+### Software
+A simple RFID to serial reciver example can be found at:
+[```examples/read_to_serial/read_to_serial.ino```](examples/read_to_serial/read_to_serial.ino)
+
+#### API
+* ```void begin(int rxPin)``` - Initialize the object to use the given GPIO pin as RX from the RDM6300.
+* ```bool update()``` - Updates the internal values by reading from the RDM6300, returns true on tag detection, must be called repeatedly!
+* ```uint32_t get_tag_id()``` - Returns the last tag id read by ```update```- can be called only once after ```update```.
+* ```bool is_tag_near()``` -  Returns whether a tag is currently held near the antenna- can be called many times after ```update```.
+## enjoy!
+A.E.TECH