📝 Added notes on how best to fstrim

fstrim_howto.md

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+## FSTRIM BASICS
+
+fstrim should be run regularly to clean up disk space.
+You can think of it as a more modern form of disk defragmentation.
+It potentially can extend the life of an ssd hard drive.
+
+fstrim should be run once a week, but should also not be more often.
+The most basic essential command to run fstrim is:
+
+```bash
+sudo fstrim -a -v -m 1MB
+```
+
+Be conscientious when running fstrim like this, as the -a flag indicates we wish
+to run fstrim on all mounted file systems that accept this command. The -m 1MB
+indicates we wish to only trim in minimum of 1 megabyte chunks. The -v flag
+indicates we wish to see 'verbose' output (like many UNIX/UNIX-like commands).