docs(veterinary): add subject

subjects/veterinary/README.md

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+## veterinary
+
+### Instructions
+
+There is a new veterinary in town!
+To help him get introduced to your neighborhood, create an object `veterinary` with the following properties:
+
+- an array of string `animalKnowledge` that will store all the animal species the new veterinary can treat,
+
+- a function `canTreat` that will receive a string as an argument and will return a boolean indicating if the string is present in the veterinary `animalKnowledge` array
+
+- a function `respondClient` that will receive two string, the pet name and the animal species of the pet, and will return a string that will include `Yes` or `No` plus the pet name accordingly.
+
+### Example
+
+```js
+veterinary.animalKnowledge.push('dog')
+console.log(veterinary.canTreat('dog')) // true
+console.log(veterinary.respondClient('Matias', 'dog')) // 'Yes, I can treat Matias'
+console.log(veterinary.respondClient('Jack', 'parrot')) // No, I cannot treat Jack'
+```
+
+### Notions
+
+- [this](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/this)