speedtest-rs: add page (#15193)

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

pages/common/speedtest-rs.md

@@ -0,0 +1,28 @@
+# speedtest-rs
+
+> An unofficial Rust-based tool for testing network speeds using speedtest.net, limited to HTTP Legacy Fallback.
+> 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`