Added Databricks cluster deployment to the user guide

[morazow]

Fixes #85.

[codecov]

Codecov Report

Merging #86 (7faeb0f) into main (e0ae378) will decrease coverage by 8.83%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
- Coverage   84.67%   75.84%   -8.84%     
==========================================
  Files          11       11              
  Lines         483      472      -11     
  Branches       63       65       +2     
==========================================
- Hits          409      358      -51     
- Misses         74      114      +40     

Impacted Files	Coverage Δ
...c/main/scala/com/exasol/spark/util/Converter.scala	3.27% <ø> (-42.04%)	⬇️
...rc/main/scala/com/exasol/spark/rdd/ExasolRDD.scala	82.75% <100.00%> (ø)
...ain/scala/com/exasol/spark/util/NextIterator.scala	0.00% <0.00%> (-94.12%)	⬇️
...c/main/scala/com/exasol/spark/ExasolRelation.scala	95.45% <0.00%> (-1.22%)	⬇️

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[AnastasiiaSergienko]

Approved with no findings