Linting. Updating docs. Updating CHANGELOG. Updating badge on README.

[vprusso]

• Adding badge on README.md.
• Updating CHANGELOG.md
• Adding autodoc summary files for new features
• Applying linting to project.

[codecov]

Codecov Report

Merging #178 (e3ecb0b) into master (aab34e5) will not change coverage.
The diff coverage is 92.8%.

@@          Coverage Diff           @@
##           master    #178   +/-   ##
======================================
  Coverage    95.9%   95.9%           
======================================
  Files         142     142           
  Lines        2993    2993           
  Branches      721     721           
======================================
  Hits         2871    2871           
  Misses         76      76           
  Partials       46      46           

Impacted Files	Coverage Δ
toqito/channel_ops/apply_channel.py	100.0% <ø> (ø)
toqito/matrix_props/is_orthonormal.py	100.0% <ø> (ø)
toqito/nonlocal_games/extended_nonlocal_game.py	100.0% <ø> (ø)
toqito/perms/permute_systems.py	100.0% <ø> (ø)
...ito/state_metrics/hilbert_schmidt_inner_product.py	100.0% <ø> (ø)
toqito/state_props/log_negativity.py	100.0% <ø> (ø)
toqito/state_props/negativity.py	100.0% <ø> (ø)
toqito/state_props/is_separable.py	62.0% <28.5%> (ø)
toqito/channel_props/is_trace_preserving.py	86.6% <50.0%> (ø)
...hannel_metrics/completely_bounded_spectral_norm.py	100.0% <100.0%> (ø)
... and 18 more

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