Website: add some documentation for the shared storage

This still needs expanding.

web/project-website/content/usage/shared-storage/_index.md

@@ -0,0 +1,41 @@
+---
+title: Shared Storage
+---
+
+Flamenco needs some form of *shared storage*: a place for files to be stored
+that can be accessed by all the computers in the farm.
+
+TODO: write more about this.
+
+## Shaman Storage System
+
+TODO: write
+
+## Platform-specific Notes
+
+### Windows
+
+TODO: lots of tricky stuff about getting symlinks to work on Windows. We may want to get inspiration from the [Git-for-Windows](https://github.com/git-for-windows/git/wiki/Symbolic-Links#allowing-non-administrators-to-create-symbolic-links) documentation.
+
+### Linux
+
+For symlinks to work with CIFS/Samba filesystems (like a typical NAS), you need
+to mount it with the option `mfsymlinks`. As a concrete example, for a user
+`sybren`, put something like this in `fstab`:
+
+```
+//NAS/flamenco /media/flamenco cifs mfsymlinks,credentials=/home/sybren/.smbcredentials,uid=sybren,gid=users 0 0
+```
+
+Then put the NAS credentials in `/home/sybren/.smbcredentials`:
+
+```
+username=sybren
+password=g1mm3acce55plz
+```
+
+and be sure to protect it with `chmod 600 /home/sybren/.smbcredentials`.
+
+Finally `mkdir /media/flamenco` and `sudo mount /media/flamenco` should get things mounted.
+
+The above info was obtained from [Ask Ubuntu](https://askubuntu.com/a/157140).