par2: add page (#12633)

pages/common/par2.md

@@ -0,0 +1,20 @@
+# par2
+
+> File verification and repair using PAR 2.0 compatible parity archives (.par2 files).
+> More information: <https://github.com/Parchive/par2cmdline/>.
+
+- Create a parity archive with a set percentage level of redundancy:
+
+`par2 create -r{{1..100}} -- {{path/to/file}}`
+
+- Create a parity archive with a chosen number of volume files (in addition to the index file):
+
+`par2 create -n{{1..32768}} -- {{path/to/file}}`
+
+- Verify a file with a parity archive:
+
+`par2 verify -- {{path/to/file.par2}}`
+
+- Repair a file with a parity archive:
+
+`par2 repair -- {{path/to/file.par2}}`