docs: Add docs example of how to use tags with feature views (#4536)

* Add docs example of how to use tags with feature views

Signed-off-by: Theodor Mihalache <[email protected]>

* Add docs example of how to use tags with feature views
- changes following review

Signed-off-by: Theodor Mihalache <[email protected]>

---------

Signed-off-by: Theodor Mihalache <[email protected]>

docs/getting-started/concepts/README.md

@@ -31,3 +31,7 @@
 {% content-ref url="permission.md" %}
 [permission.md](permission.md)
 {% endcontent-ref %}
+
+{% content-ref url="tags.md" %}
+[tags.md](tags.md)
+{% endcontent-ref %}

docs/getting-started/concepts/tags.md

@@ -0,0 +1,59 @@
+# Tags
+
+## Overview
+
+Tags in Feast allow for efficient filtering of Feast objects when listing them in the UI, CLI, or querying the registry directly.
+
+The way to define tags on the feast objects is through the definition file or directly in the object that will be applied to the feature store.
+
+## Examples
+
+In this example we define a Feature View in a definition file that has a tag:
+```python
+driver_stats_fv = FeatureView(
+    name="driver_hourly_stats",
+    entities=[driver],
+    ttl=timedelta(days=1),
+    schema=[
+        Field(name="conv_rate", dtype=Float32),
+        Field(name="acc_rate", dtype=Float32),
+        Field(name="avg_daily_trips", dtype=Int64, description="Average daily trips"),
+    ],
+    online=True,
+    source=driver_stats_source,
+    # Tags are user defined key/value pairs that are attached to each
+    # feature view
+    tags={"team": "driver_performance"},
+)
+```
+
+In this example we define a Stream Feature View that has a tag, in the code:
+```python
+    sfv = StreamFeatureView(
+        name="test kafka stream feature view",
+        entities=[entity],
+        schema=[],
+        description="desc",
+        timestamp_field="event_timestamp",
+        source=stream_source,
+        tags={"team": "driver_performance"},
+```
+
+An example of filtering feature-views with the tag `team:driver_performance`:
+```commandline
+$ feast feature-views list --tags team:driver_performance              
+NAME                       ENTITIES    TYPE
+driver_hourly_stats        {'driver'}  FeatureView
+driver_hourly_stats_fresh  {'driver'}  FeatureView
+```
+
+The same example of listing feature-views without tag filtering:
+```commandline
+$ feast feature-views list
+NAME                       ENTITIES    TYPE
+driver_hourly_stats        {'driver'}  FeatureView
+driver_hourly_stats_fresh  {'driver'}  FeatureView
+transformed_conv_rate_fresh  {'driver'}  OnDemandFeatureView
+transformed_conv_rate        {'driver'}  OnDemandFeatureView
+```
+