Enhancement: Add Template

[localheinz]

This PR

• adds Template

[codecov]

Codecov Report

Merging #20 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master    #20   +/-   ##
=======================================
  Coverage       100%   100%           
- Complexity       29     36    +7     
=======================================
  Files             8     10    +2     
  Lines            83    104   +21     
=======================================
+ Hits             83    104   +21

Impacted Files	Coverage Δ	Complexity Δ
src/Exception/InvalidReplacements.php	100% <100%> (ø)	2 <2> (?)
src/Template.php	100% <100%> (ø)	5 <5> (?)

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