[WIP] add foldAdd to all muxes

[romni]

todo

• update README.md
• write tests

[codecov]

Codecov Report

Merging #8 into master will decrease coverage by 9.24%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master       #8      +/-   ##
============================================
- Coverage       100%   90.75%   -9.25%     
  Complexity      491      491              
============================================
  Files            17       17              
  Lines           589      649      +60     
============================================
  Hits            589      589              
- Misses            0       60      +60

Impacted Files	Coverage Δ	Complexity Δ
...main/java/io/leonis/mx/Multiplex1WithoutValue.java	96.72% <0%> (-3.28%)	57 <0> (ø)
...rc/main/java/io/leonis/mx/Multiplex1WithValue.java	96.66% <0%> (-3.34%)	56 <0> (ø)
...rc/main/java/io/leonis/mx/Multiplex3WithValue.java	87.5% <0%> (-12.5%)	30 <0> (ø)
...rc/main/java/io/leonis/mx/Multiplex2WithValue.java	95.83% <0%> (-4.17%)	42 <0> (ø)
...rc/main/java/io/leonis/mx/Multiplex5WithValue.java	72% <0%> (-28%)	12 <0> (ø)
...rc/main/java/io/leonis/mx/Multiplex4WithValue.java	80.64% <0%> (-19.36%)	20 <0> (ø)
...rc/main/java/io/leonis/mx/Multiplex6WithValue.java	60% <0%> (-40%)	6 <0> (ø)
...main/java/io/leonis/mx/Multiplex3WithoutValue.java	88.63% <0%> (-11.37%)	31 <0> (ø)
...main/java/io/leonis/mx/Multiplex5WithoutValue.java	77.41% <0%> (-22.59%)	13 <0> (ø)
...main/java/io/leonis/mx/Multiplex4WithoutValue.java	82.85% <0%> (-17.15%)	21 <0> (ø)
... and 2 more

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