docs: add strategy pattern link to README

Author: AdelDaniel

README.md

@@ -73,6 +73,7 @@ Some patterns can be rendered unnecessary in languages that have built-in suppor
 - <strong><a href="structural_design_pattern/decorator/" target="_blank">Decorator</a></strong>
 
 - <strong><a href="structural_design_pattern/facade/" target="_blank">Facade</a></strong>
+
 - <strong><a href="structural_design_pattern/proxy/" target="_blank">Proxy</a></strong>
 
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@@ -92,6 +93,7 @@ Some patterns can be rendered unnecessary in languages that have built-in suppor
 - <strong><a href="behavioral_design_patterns/chain_of_responsibility/" target="_blank">Chain Of Responsibility</a></strong>
 - <strong><a href="behavioral_design_patterns/observer/" target="_blank">Observer</a></strong>
 - <strong><a href="behavioral_design_patterns/command/" target="_blank">Command</a></strong>
+- <strong><a href="behavioral_design_patterns/strategy/" target="_blank">Strategy</a></strong>
 
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