docs(contributing): add endpoint docs (#8215)

* docs(contributing): add endpoint docs

* docs(contributing): add endpoint docs

* docs(contributing): add endpoint docs

* docs(contributing): add endpoint docs

* docs(contributing): add endpoint docs

docs/contributing/go/endpoint.md

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+# Endpoint
+
+This guide outlines the recommended approach for designing endpoints, with a focus on entity relationships, RESTful structure, and examples from the codebase.
+
+## How do we design an endpoint?
+
+### Understand the core entities and their relationships
+
+Start with understanding the core entities and their relationships. For example:
+
+- **Organization**: an organization can have multiple users
+
+### Structure Endpoints RESTfully
+
+Endpoints should reflect the resource hierarchy and follow RESTful conventions. Use clear, **pluralized resource names** and versioning. For example:
+
+- `POST /v1/organizations` — Create an organization
+- `GET /v1/organizations/:id` — Get an organization by id
+- `DELETE /v1/organizations/:id` — Delete an organization by id
+- `PUT /v1/organizations/:id` — Update an organization by id
+- `GET /v1/organizations/:id/users` — Get all users in an organization
+- `GET /v1/organizations/me/users` — Get all users in my organization
+
+Think in terms of resource navigation in a file system. For example, to find your organization, you would navigate to the root of the file system and then to the `organizations` directory. To find a user in an organization, you would navigate to the `organizations` directory and then to the `id` directory.
+
+```bash
+v1/
+├── organizations/
+│   └── 123/
+│       └── users/
+```
+
+`me` endpoints are special. They are used to determine the actual id via some auth/external mechanism. For `me` endpoints, think of the `me` directory being symlinked to your organization directory. For example, if you are a part of the organization `123`, the `me` directory will be symlinked to `/v1/organizations/123`:
+
+```bash
+v1/
+├── organizations/
+│   └── me/ -> symlink to /v1/organizations/123
+│       └── users/
+│   └── 123/
+│       └── users/
+```
+
+> 💡 **Note**: There are various ways to structure endpoints. Some prefer to use singular resource names instead of `me`. Others prefer to use singular resource names for all endpoints. We have, however, chosen to standardize our endpoints in the manner described above.
+
+## What should I remember?
+
+- Use clear, **plural resource names**
+- Use `me` endpoints for determining the actual id via some auth mechanism
+
+> 💡 **Note**: When in doubt, diagram the relationships and walk through the user flows as if navigating a file system. This will help you design endpoints that are both logical and user-friendly.