Update about-section of readme

[dafeda]

Issue
Resolves #my_issue

Approach
Short description of the approach

Pre review checklist

• Added appropriate release note label
• PR title captures the intent of the changes, and is fitting for release notes.
• Commit history is consistent and clean, in line with the contribution guidelines.

Adding labels helps the maintainers when writing release notes. This is the list of release note labels.

[ManInFez]

I think we can type out ES, ES-MDA and IES

[dafeda]

Fixed

[ManInFez]

Suggested change

	ERT - Ensemble based Reservoir Tool - is designed for running
	ensembles of dynamical models such as reservoir models,
	in order to do sensitivity analysis and data assimilation.
	Supports data assimilation using the Ensemble Smoother (ES),
	Ensemble Smoother with Multiple Data Assimilation (ES-MDA) and
	Iterative Ensemble Smoother (IES).
	ERT - Ensemble based Reservoir Tool - is designed for running
	ensembles of dynamical models such as reservoir models,
	in order to do sensitivity analysis and data assimilation.
	Supports data assimilation using the Ensemble Smoother (ES),
	Ensemble Smoother with Multiple Data Assimilation (ES-MDA) and
	Iterative Ensemble Smoother (IES) methods.

[ManInFez]

or algorithms or something..

[dafeda]

I don't think that is necessary since a "Smoother" is a known method.
Hence a sentence like "Data assimilation using the Ensemble Smoother." is complete.

[berland]

"Supports" -> "It supports" ?

[dafeda]

I propose "ERT supports" since "It" leads to the sentence being in the passive voice which I don't particularly like.

[codecov-commenter]

Codecov Report

Merging #3442 (570991e) into main (e662696) will increase coverage by 4.51%.
The diff coverage is n/a.

❗ Current head 570991e differs from pull request most recent head 44d0573. Consider uploading reports for the commit 44d0573 to get more accurate results

@@            Coverage Diff             @@
##             main    #3442      +/-   ##
==========================================
+ Coverage   60.81%   65.33%   +4.51%     
==========================================
  Files         314      603     +289     
  Lines       31386    47736   +16350     
  Branches     4221     4221              
==========================================
+ Hits        19088    31186   +12098     
- Misses      10781    15190    +4409     
+ Partials     1517     1360     -157     

Impacted Files	Coverage Δ
libres/lib/enkf/field.cpp	0.70% <0.00%> (ø)
libres/lib/config/conf.cpp	61.06% <0.00%> (ø)
libres/lib/enkf/gen_kw.cpp	59.61% <0.00%> (ø)
libres/lib/python/init.cpp	22.58% <0.00%> (ø)
libres/lib/enkf/surface.cpp	2.63% <0.00%> (ø)
libres/lib/rms/rms_file.cpp	0.00% <0.00%> (ø)
libres/lib/enkf/time_map.cpp	43.46% <0.00%> (ø)
libres/lib/enkf/block_obs.cpp	42.03% <0.00%> (ø)
libres/lib/enkf/container.cpp	7.69% <0.00%> (ø)
libres/lib/enkf/enkf_main.cpp	44.03% <0.00%> (ø)
... and 336 more

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