Added some basic documentation for local filesystem mode.

docs/local_filesystem_setup.rst

@@ -0,0 +1,45 @@
+Setting up experiment storage and database in local filesystem
+==============================================================
+
+This page describes how to setup studioml to use
+local filesystem for storing experiment artifacts and meta-data.
+With this option, there is no need to setup any external
+connection to S3/Minio/GCS etc.
+
+StudioML configuration
+--------------------
+
+::
+
+      "studio_ml_config": {
+
+          ...
+
+          "database": {
+                    "type": "local",
+                    "endpoint": SOME_DB_LOCAL_PATH,
+                    "bucket": DB_BUCKET_NAME,
+                    "authentication": "none"
+          },
+          "storage": {
+                    "type": "local",
+                    "endpoint": SOME_ARTIFACTS_LOCAL_PATH,
+                    "bucket": ARTIFACTS_BUCKET_NAME,
+          }
+
+          ...
+      }
+
+
+With StudioML database type set to "local",
+all experiment meta-data will be stored locally under
+directory: SOME_DB_LOCAL_PATH/DB_BUCKET_NAME.
+Similarly, with storage type set to "local",
+all experiment artifacts will be stored locally under
+directory: SOME_ARTIFACTS_LOCAL_PATH/ARTIFACTS_BUCKET_NAME.
+
+Note: if you are using "local" mode, it is recommended to use it
+for both storage and database configuration.
+But it's technically possible to mix, for example, local storage configuration
+and S3-based database configuration etc.
+