added conda installation in docs

[satyam-jha]

i have added conda installation in docs

[mfeurer]

Thanks a lot for your contribution @satyam-jha. However, the docs now contradict themselves. There's now a section "Anaconda installation" that says that Auto-sklearn cannot be installed via Anaconda, and a section which describes how to do this. Could use please make the section "Anaconda installation" two section, one about installing the package via conda-forge, and one in the spirit of the current description? Also, could you please give a link to conda forge docs for people who don't know it? Thanks a lot!

[satyam-jha]

i have added "conda forge" section inside the "Anaconda installation" section and added links for both conda forge docs and feedstocks repos link

[codecov]

Codecov Report

Merging #1144 (8b1a6e1) into master (52dd9a1) will increase coverage by 2.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1144      +/-   ##
==========================================
+ Coverage   85.86%   88.12%   +2.26%     
==========================================
  Files         137      138       +1     
  Lines       10625    10866     +241     
==========================================
+ Hits         9123     9576     +453     
+ Misses       1502     1290     -212     

Impacted Files	Coverage Δ
...tosklearn/metalearning/metafeatures/metafeature.py	62.13% <0.00%> (-14.57%)	⬇️
autosklearn/experimental/selector.py	66.97% <0.00%> (-7.03%)	⬇️
...eline/components/feature_preprocessing/fast_ica.py	91.30% <0.00%> (-6.53%)	⬇️
...mponents/feature_preprocessing/nystroem_sampler.py	85.29% <0.00%> (-5.89%)	⬇️
...onents/data_preprocessing/rescaling/standardize.py	95.23% <0.00%> (-4.77%)	⬇️
...ents/data_preprocessing/rescaling/robust_scaler.py	96.87% <0.00%> (-3.13%)	⬇️
...ature_preprocessing/select_rates_classification.py	85.91% <0.00%> (-1.41%)	⬇️
...learn/pipeline/components/regression/libsvm_svr.py	90.24% <0.00%> (-1.22%)	⬇️
...data_preprocessing/rescaling/abstract_rescaling.py	91.30% <0.00%> (-1.01%)	⬇️
...omponents/data_preprocessing/data_preprocessing.py	90.09% <0.00%> (-0.23%)	⬇️
... and 50 more

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[franchuterivera]

Hello, thanks a lot for this PR. I had some suggestions to make the installation instructions a bit more clear.

I have added some commit suggestion because the instructions did not fully work for me. The problem is that I had conda 4.8.

Additionally, could you please also update the statement in this file about:

Anaconda does not ship *auto-sklearn*, and there are no conda packages for*auto-sklearn*. Thus, it is easiest to install *auto-sklearn* as detailed inthe Section `Installing auto-sklearn`_.

Maybe to something like:

You need to enable conda-forge to install *auto-sklearn* via anaconda. This section explains how to enable conda-forge, to be able to install *auto-sklearn* with `conda install auto-sklearn`. Optionally, you can also install *auto-sklearn* with `pip` as detailed in the Section `Installing auto-sklearn`_.