fpsync: add page (#13174)

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: spageektti <git@spageektti.cc>

pages/linux/fpsync.md

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+# fpsync
+
+> Execute several synchronization processes locally or on several remote workers through SSH.
+> More information: <https://www.fpart.org/fpsync/>.
+
+- Recursively synchronize a directory to another location:
+
+`fpsync -v {{/path/to/source/}} {{/path/to/destination/}}`
+
+- Recursively synchronize a directory with the final pass (It enables rsync's `--delete` option with each synchronization job):
+
+`fpsync -v -E {{/path/to/source/}} {{/path/to/destination/}}`
+
+- Recursively synchronize a directory to a destination using 8 concurrent synchronization jobs:
+
+`fpsync -v -n 8 -E {{/path/to/source/}} {{/path/to/destination/}}`
+
+- Recursively synchronize a directory to a destination using 8 concurrent synchronization jobs spread over two remote workers (machine1 and machine2):
+
+`fpsync -v -n 8 -E -w login@machine1 -w login@machine2 -d {{/path/to/shared/directory}} {{/path/to/source/}} {{/path/to/destination/}}`
+
+- Recursively synchronize a directory to a destination using 4 local workers, each one transferring at most 1000 files and 100 MB per synchronization job:
+
+`fpsync -v -n 4 -f 1000 -s $((100 * 1024 * 1024)) {{/path/to/source/}} {{/path/to/destination/}}`
+
+- Recursively synchronize any directories but exclude specific `.snapshot*` files (Note: options and values must be separated by a pipe character):
+
+`fpsync -v -O "-x|.snapshot*" {{/path/to/source/}} {{/path/to/destination/}}`