speedtest-rs: add page

pages/common/speedtest-rs.md

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+# speedtest-rs
+
+> A Speedtest.net testing utility and crate for checking network download and upload speeds.
+> More information: <https://github.com/nelsonjchen/speedtest-rs>.
+
+- Run a full speed test (download and upload):
+
+`speedtest-rs`
+
+- Display a list of speedtest.net servers sorted by distance:
+
+`speedtest-rs --list`
+
+- Run a download test only:
+
+`speedtest-rs --no-upload`
+
+- Run an upload test only:
+
+`speedtest-rs --no-download`
+
+- Generate a shareable link to the test results image:
+
+`speedtest-rs --share`
+
+- Display basic output information only:
+
+`speedtest-rs --simple`