Added a Readme

README.md

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+# ProjectorPi
+
+Projector is a personal tool I user to control my _Panasonic PT-RW330_ projector and _Extron IN1604 DTP_ scalar over serial using a Raspberry Pi.
+
+## Build wheels
+
+Building the project can be done using poetry. 
+
+```shell
+$ poetry build
+```
+
+## Install locally
+
+```shell
+$ pip install .
+```
+
+## Usage
+
+Make sure the user is a member of the `dialout` group.
+
+Wake projector and scaler and select input 2:
+
+```shell
+$ projectorpi 2
+```
+
+Put projector and scalar in sleep mode:
+
+```shell
+$ projectorpi --sleep
+```