Merge branch 'add_doc' into 'master'

Add doc

See merge request !2
4 jobs for master in 1 minute and 4 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Build Testinstall
failed #382699
dailyBuildMasterAll

00:01:04

 
  Doc Coverage
skipped #382702
Doc
skipped #382700
TestCoverage
 
  Deploy
skipped #382704
pages
 
Name Stage Failure
failed
dailyBuildMasterAll Build Testinstall
Call Stack (most recent call first):
cmake/pull_extra_module.cmake:97 (get_extra_module)
CMakeLists.txt:10 (pull_extra_module)


-- Configuring incomplete, errors occurred!
See also "/builds/CTA-LAPP/PHOENIX_LIBS/PhoenixHPCProxy/build/CMakeFiles/CMakeOutput.log".
Cleaning up file based variables
ERROR: Job failed: exit code 1