Add Kotlin/JS installation instructions to README

[redbassett]

Resolves #7

[codecov]

Codecov Report

Merging #8 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #8   +/-   ##
=========================================
  Coverage     97.05%   97.05%           
  Complexity      130      130           
=========================================
  Files            41       41           
  Lines           475      475           
  Branches         16       16           
=========================================
  Hits            461      461           
  Misses            9        9           
  Partials          5        5           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9f9413c...144a242. Read the comment docs.

[redbassett]

As per #9, this PR is now incorrect until a new host is established.

[harryjph]

Please see #10

[redbassett]

PR is now outdated by subsequent updates.