Add readme.md

README.md

+# Nexboot - Bootloader for ESP32 developement boards
+
+I was unable to find any bootloader for ESP32 doing what i would like to have, so, 
+i started to write my own.
+
+### How to install
+ * install and configure esp-ipf and the esp32 toolkit
+ * git clone the whole repository and subrepositories under your own project dir
+ * make menuconfig to configure nexboot
+ * erase the flash in your board ( suggested, not really needed )
+ * build and upload as usual with make and make flash on your esp32 developement board.
+ 
+### Assumptions:
+ 
+ * you are updating your esp32 developement board.
+ * your board have 4MB of flash size, or you will have to change the partitions.csv file 
+ * you know what you are doing
+ * No, it isn't finished and ready to use in production.
+ * Yes, i will continue to work on it to improve it and eventually make it production ready.
+ * No, i will not fix your computer
+
+### Features
+ * update OTA over WiFi, in AP or STA mode, wpa2 supported.
+ * update OTA via web browser, on the ESP32 board IP
+ * Force bootloader mode on boot by activating GPIO26
+ * It leave you 3MB of space for your OTA firmware ( with a 4MB flash )
+ 
+### Planned
+ * HTTPS instead of HTTP ( configurable )
+ * Authenticate login on HTTP/s
+ * Firmware encryption
+ * Firmware hash pre-verification
+ * Better HTML/JS
+ 
+### Status
+ 
+Fairly limited atm, but it works. Really need a better interface and a lot of other things.