Update readme

readme.md

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-Workout Tracker for top sets
+# Workout tracker
+
+Track topsets over time.
+
+### Setup
+
+Install `python>3`
+
+Install dependencies
+
+```
+$ pip install -r requirements.txt
+```
+
+Enable development mode
+
+```
+PS $ENV:FLASK_ENV='development'
+```
+
+Set database url, either setup postgres database locally use migration script or expose deployed one
+
+```
+$Env:DATABASE_URL = 'postgres://postgres:***@***:***/***'
+```
+
+Start application:
+
+```
+flask run
+```
+
+### Features
+
+- [x] Track topsets for each workout
+- [x] Multi user
+- [ ] Authentication/Authorisation