add HowTo guide for mounting ceph temporarily

docs/source/programming/Mount-ceph-ubuntu-temp.md

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+# Mount ceph storage on Ubuntu temporarily
+In this example, we will **temporarily** mount a partition of `ceph` in an Ubuntu machine. The mounting is temporarily because it will only remain until the next reboot. To mount a partition of `ceph` permanently, see [Mount ceph storage on Ubuntu](Mount-ceph-ubuntu.md).
+
+
+## Prerequisites
+- Administrator rights (`sudo`) on the local Ubuntu machine
+- `cifs-utils` installed via `sudo apt-get install cifs-utils`
+
+
+## Steps
+### 1. Create a mount point
+Create a directory to mount the storage to. Sensible places to do this on Ubuntu would be in `/mnt` or `/media`. In the example below, we will use `/mnt/ceph-neuroinformatics`.
+
+```bash
+sudo mkdir /mnt/ceph-neuroinformatics
+```
+
+### 2. Mount the `ceph` partition
+To mount the desired partition on the directory we just created, run the `mount` command with the appropriate options. In our example, this would be:
+```bash
+sudo mount -t cifs -o user=<SWC-USERNAME>,domain=AD.SWC.UCL.AC.UK //ceph-gw02.hpc.swc.ucl.ac.uk/neuroinformatics /mnt/ceph-neuroinformatics	
+```
+:::{note}
+You can check the full set of options for the `mount` command by running `mount --help`
+:::
+
+Make sure to replace the following for your particular case:
+- `//ceph-gw02.hpc.swc.ucl.ac.uk/neuroinformatics` with the path to your desired partition, e.g. `//ceph-gw02.hpc.swc.ucl.ac.uk/<LAB-NAME>`
+- `/media/ceph-neuroinformatics` with the path to the local mount point you created in the previous step.
+- `<SWC-USERNAME>` with your SWC username
+
+If the command is executed without errors you will be prompted for your SWC password. 
+
+### 3. Check the partition is mounted correctly. 
+It should show up in the list of mounting points when running `df -h`
+
+:::{note}
+The command `df` prints out information about the file system
+:::
+
+### 4. To unmount the storage
+Run the following command
+```bash
+sudo umount /mnt/ceph-neuroinformatics
+```
+Remember that because the mounting is temporary, the `ceph` partition will be unmounted upon rebooting our machine. 
+
+You can check that the partition is correctly unmounted by running `df -h` and verifying it does not show in the output.
+
+
+### References
+- [Mount network drive under Linux temporarily/permanently](https://www.rz.uni-kiel.de/en/hints-howtos/connecting-a-network-share/Linux/through-temporary-permanent-mounting/mount-network-drive-under-linux-temporarily-permanently)
+- [How to Mount a SMB Share in Ubuntu](https://support.zadarastorage.com/hc/en-us/articles/213024986-How-to-Mount-a-SMB-Share-in-Ubuntu)