Chore: Create README.md for Rest Typings (#25335)

packages/rest-typings/README.md

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+
+#  @rocket.chat/rest-typings
+
+Package containing all Rocket.Chat rest endpoint definitions
+
+
+## Contributing
+
+Contributions are always welcome!
+However we have some recommendations.
+- Check if your implementation matches your definitions, a bad definition is worse than none.
+- Use the generic types we created for paging.
+- Create functions that assert properties (very useful for the backend)
+- Do tests to ensure that your assertions are correct.
+- Avoid incomplete and unknow typings
+
+### Good examples of what not to do:
+
+#### If you have an endpoint that accepts name or id, both are not optional, one of them is required
+
+```typescript
+
+    type EndPointTestGetParams = { name?: string; id?: string; } // WRONG!
+
+    type EndPointTestGetParams = { name: string; } | { id: string; } // Better :)
+````
+
+#### If you have an endpoint that accepts name or id, both are not optional, one of them is required
+
+```typescript
+    export const isEndPointTestGetParams = (props: any) is EndPointTestGetParams => 'name' in prop || 'id' in prop; // WRONG!
+
+    // .... Better
+    
+    
+    import Ajv from 'ajv';
+
+    const ajv = new Ajv();
+    const endPointTestGetParams = {
+        oneOf: [
+            {
+                type: 'object',
+                properties: {
+                    name: {
+                        type: 'string',
+                    },
+                },
+                required: ['name'],
+                additionalProperties: false,
+            },
+            {
+                type: 'object',
+                properties: {
+                    id: {
+                        type: 'string',
+                    },
+                },
+                required: ['id'],
+                additionalProperties: false,
+            },
+        ],
+    };
+
+    export const isEndPointTestGetParams = ajv.compile<EndPointTestGetParams>(endPointTestGetParams);
+```
+## Optimizations
+
+we use interfaces to register endpoints, so if you use a custom version, or miss an endpoint, you don't necessarily need to recompile the code, you can do it in your own code
+
+```typescript
+    declare module '@rocket.chat/rest-typings' {
+        interface Endpoints {
+            'custom/endpoint': {
+                GET: (params: PaginatedRequest<{ query: string }>) => PaginatedResult<{
+                    some: string[];
+                }>;
+            };
+        }
+    }
+```
+
+## License
+
+MIT
+