Add install guide

README.md

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+# Setup
+On a raspberry pi:
+
+## Install
+`git clone https://code.techinc.nl/emilevs/label_printer.git`\
+`sudo apt install python3-flask`\
+`sudo apt install golang`
+
+(there might be more dependencies, I wasn't starting from a clean raspbian install when testing this)
+
+run `make` to build the go library
+
+`cp label_printer.service to /etc/systemd/system/`
+
+```
+sudo systemctl enable label_printer
+sudo systemctl start label_printer
+```
+
+The interface will now be running on localhost:5000, which we need to route to the outside world in the next step
+
+## Setup the nginx
+sudo apt install nginx
+edit /etx/nginx/sites-available/default and change the contents of:
+```
+location / { }
+```
+
+to:
+
+```
+location / {
+    proxy_pass http://127.0.0.1:5000;
+    proxy_redirect http://127.0.0.1:5000 $scheme://$host:5000;
+}
+```
+
+```
+sudo systemctl restart nginx
+```
+
+## Setup static ip on the pi
+edit `/etc/dhcpcd.conf` and add:
+```
+static ip_address=10.209.10.2/24
+static routers=10.209.10.254
+static domain_name_servers=10.209.10.255
+```