Created the addon validation

validations/addon.js

@@ -0,0 +1,63 @@
+const Joi = require('joi');
+
+// The addon validation used when searching one or multiple addons by a query
+module.exports.search = Joi.object({
+    query: Joi.string()
+        .min(3)
+        .max(100)
+        .required(),
+    limit: Joi.number()
+});
+
+// The addon links shown in the addon info
+module.exports.links = Joi.object({
+    website: Joi.string()
+        .uri()
+        .max(100),
+    documentation: Joi.string()
+        .uri()
+        .max(150),
+    donation: Joi.string()
+        .uri()
+        .max(150),
+    source_code: Joi.string()
+        .uri()
+        .max(150)
+});
+
+// The addon creation validation
+module.exports.create = Joi.object({
+    name: Joi.string()
+        .min(3)
+        .max(25)
+        .required(),
+    info: Joi.string()
+        .min(10)
+        .max(50),
+    description: Joi.string()
+        .min(100)
+        .max(1000),
+    type: Joi.string()
+        .valid("bk-plugin", "bc-plugin", "world", "datapack", "texturepack", "config")
+        .required(),
+    links: this.links,
+    languages: Joi.array()
+        .items(Joi.string().min(2).max(10)),
+    price: Joi.number().max(100).default(0)
+});
+
+// The addon update validation
+module.exports.updateAddon = Joi.object({
+    name: Joi.string()
+        .min(3)
+        .max(25),
+    info: Joi.string()
+        .min(10)
+        .max(50),
+    description: Joi.string()
+        .min(100)
+        .max(1000),
+    languages: Joi.array()
+        .items(Joi.string().min(2).max(10)),
+    price: Joi.number().max(100).default(0)
+}).min(1);