http-prompt.md: add page (#1829)

pages/linux/http-prompt.md

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+# http-prompt
+
+> An interactive command-line HTTP client featuring autocomplete and syntax highlighting.
+
+- Launch a session targeting the default url of http://localhost:8000 or the previous session:
+
+`http-prompt`
+
+- Launch a session with a given url:
+
+`http-prompt {{http://example.com}}`
+
+- Launch a session with some initial options:
+
+`http-prompt {{localhost:8000/api}} --auth {{username:password}}`