Added email signup element

[mak001]

No description provided.

[codecov]

Codecov Report

Merging #27 into master will increase coverage by 0.51%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #27      +/-   ##
============================================
+ Coverage     85.55%   86.07%   +0.51%     
- Complexity       75       77       +2     
============================================
  Files            17       18       +1     
  Lines           270      280      +10     
============================================
+ Hits            231      241      +10     
  Misses           39       39

Impacted Files	Coverage Δ	Complexity Δ
src/Elements/ElementFeatures.php	100% <ø> (ø)	5 <0> (ø)	⬇️
src/Elements/ElementAccordion.php	100% <ø> (ø)	4 <0> (ø)	⬇️
src/Elements/ElementEmailSignup.php	100% <100%> (ø)	2 <2> (?)

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