Update docs and template

recipes/002_registration.py

@@ -74,7 +74,7 @@
   - `author`: The author of the package. It can be your name or your organization name.
   - `title`: The package title. It should not be a class/function name but a human-readable name. For example, `Demo Sampler` is a good title, but `DemoSampler` is not.
   - `description`: A brief description of the package. It should be a one-sentence summary of the package.
-  - `tags`: The package tags. It should be a list of strings. The tags must include `sampler` or `visualization` depending on the type of the package. You can add other tags as needed. For example, "['sampler', 'LLM']".
+  - `tags`: The package tags. It should be a list of strings. The tags must include `sampler`, `visualization`, or `pruner` depending on the type of the package. You can add other tags as needed. For example, "['sampler', 'LLM']".
   - `optuna_versions`: A list of Optuna versions that the package supports. It should be a list of strings. For example, "['3.5.0', '3.6.1']".
   - `license`: The license of the package. It should be a string. For example, `'MIT License'`. The license must be `MIT License` in the current version of OptunaHub.
 

template/README.md

@@ -12,6 +12,11 @@ This is an example of the frontmatters.
 All columns must be string.
 You can omit quotes when value types are not ambiguous.
 However, quotes are required in ambiguous cases, e.g., '3.5' must not be 3.5.
+For tags, a package placed in
+- package/samplers/ must include the tag "sampler"
+- package/visualilzation/ must include the tag "visualization"
+- package/pruners/ must include the tag "pruner"
+respectively.
 
 ---
 author: Optuna team