Sketch out next steps in language server features

[hzeller]

• File feature requests Language Server: implement textDocument/hover #1187, LanguageServer: how to tell language server which are relevant files to resolve symbols from #1188, Language Server: implement textDocument/definition , textDocument/declaration, textDocument/references #1189, Language Server: implement textDocument/documentLink #1190
• Reference these in the README to easily follow progress
• Write JSON RPC protocol definition for these features.

Signed-off-by: Henner Zeller [email protected]

[codecov-commenter]

Codecov Report

Merging #1191 (7949034) into master (aa14e00) will not change coverage.
The diff coverage is n/a.

❗ Current head 7949034 differs from pull request most recent head c6e3d4c. Consider uploading reports for the commit c6e3d4c to get more accurate results

@@           Coverage Diff           @@
##           master    #1191   +/-   ##
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  Coverage   92.77%   92.77%           
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  Files         337      337           
  Lines       22811    22811           
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  Hits        21164    21164           
  Misses       1647     1647           

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