http-prompt.md: add page

A great http interactive tool.

pages/linux/http-prompt.md

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+# http-prompt
+
+> An interactive command-line HTTP client featuring autocomplete and syntax highlighting.
+
+- Start with the last session or http://localhost:8000:
+
+`http-prompt`
+
+- Start with the given URL:
+
+`http-prompt {{http://httpbin.org}}`
+
+- Start with some initial options:
+
+`http-prompt {{localhost:8000/api}} --auth user:pass username={{somebody}}`