Update README.md

README.md

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 # Part 1.1 - Create class `Option`
 * Create an `Option` class in the `domain` sub-package.
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+* `Option` class signature is annotated with `@Entity`
 * `Option` has an `id` instance variable of type `Long`
 	* `id` should be `annotated` with
 		* `@Id`
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 # Part 1.2 - Create class `Poll`
 * Create a `Poll` class in the `domain` sub-package.
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+* `Poll` class signature is annotated with `@Entity`
 * `Poll` has an `id` instance variable of type `Long`
 	* `id` should be `annotated` with
 		* `@Id`
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 # Part 1.3 - Create class `Vote`
 * Create a `Vote` class in the `domain` sub-package.
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+* `Vote` class signature is annotated with `@Entity`
 * `Vote` has an `id` instance variable of type `Long`
 	* `id` should be `annotated` with
 		* `@Id`