Update README

README.md

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+# How to use the script
+
+## Installation of the libraries
+
+Create a venv:
+```
+$ python -m venv api
+```
+
+Activate the venv:
+```
+$ source ./api/bin/activate
+```
+
+Install the following libraries:
+```
+# Google APIs Client Library for Python
+(api) $ pip install --upgrade google-api-python-client
+
+# The google-auth-oauthlib and google-auth-httplib2 libraries for user authorization.
+(api) $ pip install --upgrade google-auth-oauthlib google-auth-httplib2
+```
+
+Now we're all set!
+
+## Usage of the script
+*The following command assumes that you own a YouTube channel with some playlists.
+
+In a terminal with the `api` venv activated, type:
+```
+(api) $ python youtube_api.py channel video_ID
+```
+
+where `playlist_name` is the name of the playlist where you want to insert the
+video `video_ID`.
+
+A new browser instance will pop up where you will have to identify yourself and 
+follow the instructions. Use `username`, `password` and `phone number` from
+`my_credentials`.