Add Shakespeare esolang

languages/shakespeare/README.md

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+# Shakespeare
+
+## References
+
+- Official documentation and implementation: http://shakespearelang.sourceforge.net
+
+## Implementation details
+
+- It is not necessary for questions to immediately be followed by conditionals. Conditionals
+  must immediately follow a question though - a runtime error is thrown otherwise.
+
+- Empty acts and scenes are invalid. An act must contain at least one scene, and a scene must contain
+  at least one dialogue set or entry-exit clause.