Update README.md

Author: harsimus

README.md

@@ -1,4 +1,23 @@
 # SensorGridAPI
 Web API and dashboard for SensorGrid
 
-# API 
+## API 
+```
+cd sensorgridapi
+```
+If you have just installed the project, run: 
+```
+mkvirtualenv sgapienv
+```
+Or if you have already run it before run this to get into the virtualenv:
+```
+workon sgapienv
+```
+After you are in the correct virtualenv, run:
+```
+pip install -r requirements.txt
+```
+Now that you have your environment set up and up to date, you can 
+```
+cd sensorgridapi
+```