Add Chef language implementation

engines/chef/README.md

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+# Chef
+
+- Ingredient names are case-sensitive and must not contain periods.
+- Auxiliary recipe names are case-sensitive. If the recipe title is `Chocolate Sauce`, calling instruction must be `Serve with Chocolate Sauce` and not `Serve with chocolate sauce`.
+- Each method instruction must end with a period.
+- The method section can be spread across multiple lines.
+- A single method instruction cannot roll over to the next line.
+- The Chef language involves usage of present and past forms of verbs:
+  ```
+  Blend the sugar
+  <other instructions>
+  Shake the mixture until blended
+  ```
+  The Esolang Park interpreter cannot convert verbs between the two forms, so we adopt the following convention: the past form of the verb is the same as the present form of the verb. So the above example must be changed to the following for Esolang Park:
+  ```
+  Blend the sugar
+  <other instructions>
+  Shake the mixture until blend
+  ```