📝 Add more docs for query hub

website/src/content/docs/docs/usage/query-hub.mdx

@@ -28,6 +28,58 @@ anyquery run hello_world
 
 Anyquery will take care of asking you for the necessary information to run the query.
 
+You can also run a query from an https URL, or from a local file. For example, to run a query from a URL:
+
+```bash
+# Run a query from an https URL
+anyquery run https://raw.githubusercontent.com/julien040/anyquery/main/queries/github_stars_per_day.sql
+# Run a query from a local file
+anyquery run ./queries/github_stars_per_day.sql
+```
+
+## Contributing
+
+By contributing to the Query Hub, you can help others answer their data questions, thank you for your help! Queries start with a top-level comment that describes what the query does in TOML. Here is an example:
+
+```sql
+/*
+title = "GitHub Stars per day"
+description = "Discover the number of stars per day for a given repository ordered by date (recent first)"
+
+plugins = ["github"]
+
+author = "julien040"
+
+tags = ["github", "stars", "statistics"]
+
+arguments = [
+{title="repository", display_title = "Repository name (owner/repo format)", type="string", description="The repository to fetch stars from (owner/repo)", regex="^[a-zA-Z0-9_-]+/[a-zA-Z0-9_-]+$"}
+]
+
+ */
+SELECT * FROM my_table(@repository)
+```
+
+Here is an overview of the fields you can use in the top-level comment:
+- `title`: The title of the query. Often, it's formatted as a question.
+- `description`: A short description of what the query does to help users find it in the Query Hub.
+- `plugins`: An array of plugins that the query uses.
+- `author`: The github username of the author.
+- `tags`: An array of tags to help users find the query.
+- `arguments`: An array of arguments that the query needs to run. Each argument is an object with the following fields:
+  - `title`: The title of the argument.
+  - `display_title`: The title of the argument displayed to the user.
+  - `type`: The type of the argument. It can be `string`, `int`, `float` and `bool`.
+  - `description`: A description of the argument.
+  - `regex`: A regex to validate the argument.
+
+
+Each argument in the `arguments` array will be asked to the user when running the query. They will be passed to the query as named parameters. You can specify them in the query using the `@` symbol followed by the argument name.
+
+```sql
+SELECT * FROM my_table(@repository)
+```
+
 ## Reference
 
 You can find the full documentation of the `anyquery run` command [here](/docs/reference/commands/anyquery_run).