Move pages under tldr, lint run.sh, update docs

tldr/ffsend

@@ -0,0 +1,29 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ffsend
+
+> Easily and securely share files.
+> More information: <https://gitlab.com/timvisee/ffsend>.
+
+- Upload a file:
+
+`ffsend upload {{path/to/file}}`
+
+- Download a file:
+
+`ffsend download {{url}}`
+
+- Upload a file with password:
+
+`ffsend upload {{path/to/file}} -p {{password}}`
+
+- Download a file protected by password:
+
+`ffsend download {{path/to/file}} -p {{password}}`
+
+- Upload a file and allow 4 downloads:
+
+`ffsend upload {{path/to/file}} -d {{4}}`