Update README.md

README.md

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 # SlingTV-Stream-Extractor
 Extracts stream url and drm keys from chosen SlingTV live channel
+
+Prerequisites:
+  - SlingTV account
+  - Non-blocked USA vpn
+  - Pywidevine cdm file in .wvd format
+
+Usage:
+  - Login to SlingTV in your browser
+  - Go to local storage and copy the value of variable "persist:root"
+  - Make a file called "user.txt" next to slingtv.py and save the copied string into it
+  - pip install -r requirements.txt
+  - slingtv.py