Update README.md files for the gdrive_text_embedding example. (#173)

* Update `README.md` for `gdrive_text_embedding` example.

* Add the `gdrive_text_embedding` to top level `README.md`.

#108

Author: badmonster0

README.md

@@ -96,6 +96,7 @@ Go to the [examples directory](examples) to try out with any of the examples, fo
 | [Code Embedding](examples/code_embedding) | Index code embeddings for semantic search |
 | [PDF Embedding](examples/pdf_embedding) | Parse PDF and index text embeddings for semantic search |
 | [Manuals LLM Extraction](examples/manuals_llm_extraction) | Extract structured information from a manual using LLM |
+| [Google Drive Text Embedding](examples/gdrive_text_embedding) | Index text documents from Google Drive |
 
 More coming and stay tuned! If there's any specific examples you would like to see, please let us know in our [Discord community](https://discord.com/invite/zpA9S2DR7s) 🌱.
 

examples/gdrive_text_embedding/.env.example

@@ -1,8 +1,10 @@
 # Postgres database address for cocoindex
 COCOINDEX_DATABASE_URL=postgres://cocoindex:cocoindex@localhost/cocoindex
 
-# Google Drive service account credential path
-# GOOGLE_SERVICE_ACCOUNT_CREDENTIAL=/path/to/service_account_credential.json
+# Google Drive service account credential path. 
+#! PLEASE FILL IN
+GOOGLE_SERVICE_ACCOUNT_CREDENTIAL=/path/to/service_account_credential.json
 
-# Google Drive root folder IDs, comma separated
-# GOOGLE_DRIVE_ROOT_FOLDER_IDS=id1,id2
+# Google Drive root folder IDs, comma separated.
+#! PLEASE FILL IN
+GOOGLE_DRIVE_ROOT_FOLDER_IDS=id1,id2

examples/gdrive_text_embedding/README.md

@@ -1,7 +1,25 @@
 Simple example for cocoindex: build embedding index based on Google Drive files.
 
 ## Prerequisite
-[Install Postgres](https://cocoindex.io/docs/getting_started/installation#-install-postgres) if you don't have one.
+
+Before running the example, you need to:
+
+1.  [Install Postgres](https://cocoindex.io/docs/getting_started/installation#-install-postgres) if you don't have one.
+
+2.  Prepare for Google Drive:
+
+    -   Setup a service account in Google Cloud, and download the credential file.
+    -   Share folders containing files you want to import with the service account's email address.
+
+    See [Setup for Google Drive](https://cocoindex.io/docs/ops/sources#setup-for-google-drive) for more details.
+
+3.  Create `.env` file with your credential file and folder IDs.
+    Starting from copying the `.env.example`, and then edit it to fill in your credential file path and folder IDs.
+
+    ```bash
+    cp .env.exmaple .env
+    $EDITOR .env
+    ```
 
 ## Run