Update README.md

Author: me-no-dev

README.md

@@ -1,9 +1,26 @@
 Arduino core for ESP32 WiFi chip
 ===========================================
 
+### Development Status
+Not everything is working yet, you can not get it through package manager, but you can give it a go and help us find bugs in the things that are implemented :)
+
+The framework can also be downloaded as component in an IDF project and be used like that.
+
+Things that "should" work:
+- pinMode
+- digitalRead/digitalWrite
+- attachInterrupt/detachInterrupt
+- Serial (global Serial is attached to pins 1 and 3 by default, there are another 2 serials that you can attach to any pin)
+- SPI (global SPI is attached to VSPI pins by default and HSPI can be attached to any pins)
+- Wire (global Wire is attached to pins 21 and 22 by default and there is another I2C bus that you can attach to any pins)
+- WiFi (about 99% the same as ESP8266)
+
+WiFiClient, WiFiServer and WiFiUdp are not quite ready yet because there are still some small hiccups in LwIP to be overcome.
+You can try WiFiClient but you need to disconnect the client yourself to be sure that connection is closed.
+
 ### Installation
-- Install Arduino 1.6.9
-- Go to Arduino directory
+- Install Arduino IDE
+- Go to Arduino IDE installation directory
 - Clone this repository into hardware/espressif/esp32 directory (or clone it elsewhere and create a symlink)
 ```bash
 cd hardware