add developer guide for loading data

docs/dev_guide.md

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+# JupyterLab Developer Guide
+
+## Accessing JupyterLab Development Environment
+(Please refer to the [JupyterLab User Guide](user_guide.md) for instructions on accessing the user environment.)
+
+### 1. Create SSH Tunnel:
+
+Execute the following command to create an SSH tunnel to the remote server (`login1.berkeley.kbase.us`):
+
+```bash
+ssh -f -N -L localhost:44041:10.58.2.201:4041 <ac.anl_username>@login1.berkeley.kbase.us
+```
+
+### 2. Access JupyterLab Notebooks:
+
+Open a web browser and navigate to the following URL:
+
+```
+http://localhost:44041
+```
+This will open the JupyterLab Notebook interface running on the remote server.
+
+
+## Accessing MinIO
+Please refer to the [MinIO Guide](minio_guide.md) for instructions on accessing MinIO.
+
+### Read/Write MinIO username and password
+Get the MinIO username and password with read/write permission from the above development JupiterLab environment.
+```python
+import os
+minio_username, minio_password = os.environ['MINIO_ACCESS_KEY'], os.environ['MINIO_SECRET_KEY']
+print(f"MinIO username: {minio_username},\nMinIO password: {minio_password}")
+```
+
+### Naming conventions
+Please adhere to the following naming conventions for MinIO buckets and objects:
+
+#### Source Files:
+Source files are the raw data files that are uploaded to MinIO.
+* Bucket name: `namespace_name`-source
+* File name: The file name should either clearly represent the table name or be formatted in a way that allows a 
+program to easily extract the table name from it.
+
+#### Delta Table Files:
+Delta table files are Parquet files generated by Spark during the creation of a table.
+* Bucket name: `namespace_name`-delta
+
+## Loading Notebooks
+Please create a corresponding loading notebook for each namespace in the `data-loading-notebooks` directory.
+
+Please use the existing loading notebooks as examples.
+
+🚨 **Please DO NOT rerun the existing loading notebooks in the development environment unless you are certain you 
+want to reload the existing table. Instead, create a new notebook for each new namespace and manually verify 
+the data loading process.**
+
+
+
+
+
+
+