httpie.md: add page (#1828)

pages/linux/httpie.md

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+# httpie
+
+> A user friendly command line HTTP tool.
+
+- Send a GET request (default method with no request data):
+
+`http {{https://example.com}}`
+
+- Send a POST request (default method with request data):
+
+`http {{https://example.com}} {{hello=World}}`
+
+- Send a POST request with redirected input:
+
+`http {{https://example.com}} < {{file.json}}`
+
+- Send a PUT request with a given json body:
+
+`http PUT {{https://example.com/todos/7}} {{hello=world}}`
+
+- Send a DELETE request with a given request header:
+
+`http DELETE {{https://example.com/todos/7}} {{API-Key:foo}}`
+
+- Show the whole HTTP exchange (both request and response):
+
+`http -v {{https://example.com}}`
+
+- Download a file:
+
+`http --download {{https://example.com}}`