snap: add description

.snapcraft.yml

@@ -1,5 +1,36 @@
 name: tqdm
 summary: A fast, extensible CLI progress bar
+description: |
+ https://tqdm.github.io
+
+ `tqdm` means "progress" in Arabic (taqadum, تقدّم) and is an
+ abbreviation for "I love you so much" in Spanish (te quiero demasiado).
+
+ Instantly make your loops show a smart progress meter and stats - just
+ replace any pipe "`|`" with "`| tqdm |`", and you're done!
+
+ ```sh
+ $ seq 9999999 | tqdm --bytes | wc -l
+ 75.2MB [00:00, 217MB/s]
+ 9999999
+ $ 7z a -bd -r backup.7z docs/ | grep Compressing | \
+     tqdm --total $(find docs/ -type f | wc -l) --unit files >> backup.log
+ 100%|███████████████████████████████▉| 8014/8014 [01:37<00:00, 82.29files/s]
+ ```
+
+ Overhead is low -- about 60ns per iteration.
+
+ In addition to its low overhead, `tqdm` uses smart algorithms to predict
+ the remaining time and to skip unnecessary iteration displays, which
+ allows for a negligible overhead in most cases.
+
+ `tqdm` works on any platform (Linux, Windows, Mac, FreeBSD, NetBSD,
+ Solaris/SunOS), in any console or in a GUI, and is also friendly with
+ IPython/Jupyter notebooks.
+
+ `tqdm` does not require any dependencies, just
+ an environment supporting `carriage return \r` and
+ `line feed \n` control characters.
 adopt-info: tqdm
 grade: stable
 confinement: strict