add feature list to README

README.md

@@ -8,6 +8,28 @@ A simple DIY plant growing system (for cannabis).
 
 # WORK IN PROGRESS
 
+## Features
+
+- Measure values
+  - Humidity
+  - soil moisture
+  - temperature
+  - water level for water tank
+- LED grow light control (on/off, dimming, max. 12V 50W load )
+- fan control (on/off, (PWM?) max 1A)
+- pump control for automatic watering (max 1A)
+- Web UI and REST API for data and controlling
+  - simple web ui
+  - Send notifications with web call (e.g. for mastodon)
+  - predefined grow profiles
+  - persistend data 
+    - Start of Grow
+    - day of grow
+    - grow profile
+    - wifi settings
+    - settings in general
+- Easy to build for beginners (i hope so!)
+
 ## Parts used
 
 - ESP8266 D1 mini