Add Curl With Cookies as a unix til

unix/curl-with-cookies.md

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+# Curl With Cookies
+
+Some endpoints require certain cookies to be included in order to get the
+response you are looking for. For instance, if the endpoint is authenticated
+with a session cookie, then you will need to provide that session cookie when
+curling.
+
+The `-b` flag can be used to instruct `curl` to include a cookie in the header
+of a request.
+
+```bash
+$ curl -b session=abc123SessionToken https://authenticated-url.com
+```
+
+See `man curl` for more details and other flags.