add readme

README.md

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+# ldap-web aka profile.hackerspace.pl
+
+## quick start locally
+
+```
+(set python version to old enough version - see .python-version)
+python3-m venv .venv
+. .venv/bin/activate
+pip3 install -r requirements.txt
+FLASK_ENV=development FLASK_APP=webapp python3 -m flask run -p 5001
+```
+
+Open app at localhost:5001
+
+## quick start (dockerized)
+
+```
+docker build -t ldapweb .
+docker run -p 8000:8000 ldapweb
+```
+
+Open app at localhost:8000
+
+## deployment
+
+Look for `ldapweb.libsonnet` in hscloud repo