Repo updates

[AntObi]

Pull Request Template

• Added attribute for checking if an Embedding instance is standardised
• Added method standardise to the Embedding class to standardise the vectors
• Added examples to main README.md
• Added visualisations to main README.md
• Added link to representation folder in README.md
• Added usage examples of the composition module to the README.md
• Replaced oliynyk.json with oliynyk.csv to preserve feature labels
• Updated core.py

Fixes #67

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

Test Configuration:

• Python version: 3.9
• Operating System: WSL2(Ubuntu)

Reviewers

N/A

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[codecov]

Codecov Report

Merging #83 (fb2e072) into main (13c73d3) will decrease coverage by 0.34%.
Report is 10 commits behind head on main.
The diff coverage is 86.79%.

@@            Coverage Diff             @@
##             main      #83      +/-   ##
==========================================
- Coverage   90.96%   90.62%   -0.34%     
==========================================
  Files           9        9              
  Lines         852      896      +44     
==========================================
+ Hits          775      812      +37     
- Misses         77       84       +7     

Files Changed	Coverage Δ
src/elementembeddings/core.py	83.98% <82.92%> (-0.58%)	⬇️
src/elementembeddings/tests/test_core.py	100.00% <100.00%> (ø)