Add cli client

[datitran]

Added a simple client to use our library in the terminal (refer to #45 for specs).

Now users can invoke our library like this:

imagededup find-duplicates --image_dir path/to/image/directory --method PHash

For more information on all available options, users can use the --help flag.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (dev@11b9999). Click here to learn what that means.
The diff coverage is 100%.

@@          Coverage Diff           @@
##             dev      #47   +/-   ##
======================================
  Coverage       ?   95.46%           
======================================
  Files          ?       17           
  Lines          ?      639           
  Branches       ?        0           
======================================
  Hits           ?      610           
  Misses         ?       29           
  Partials       ?        0

Impacted Files	Coverage Δ
imagededup/client/client.py	95.23% <100%> (ø)

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[Stunkymonkey]

ping @idealo. I think more people are interested in having this.

[dmotte]

+1 for this. It would be a great addition :) I'm currently using my own simple wrapper script, but having an official built-in one would be awesome 🙏

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.46%. Comparing base (1d2f2f7) to head (5c9cdd0).
⚠️ Report is 205 commits behind head on dev.

Files with missing lines	Patch %	Lines
imagededup/client/client.py	95.23%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #47      +/-   ##
==========================================
- Coverage   95.46%   95.46%   -0.01%     
==========================================
  Files          16       17       +1     
  Lines         618      639      +21     
==========================================
+ Hits          590      610      +20     
- Misses         28       29       +1     

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