Set up for use as Python package (#6)

* Set so loadable module in python

* Add python package usage instructions

Author: egrace479

README.md

@@ -15,15 +15,25 @@ pip install git+https://github.com/Imageomics/sum-buddy
 
 ## How it Works
 
+### Command Line Usage
+
 ```
 usage: sum-buddy [-h] --input-dir INPUT_DIR --output-file OUTPUT_FILE
 
 Generate CSV with filepath, filename, and MD5 checksums for all files in a given directory
 
 options:
-  -h, --help            show this help message and exit
-  --input-dir INPUT_DIR
-                        Directory to traverse for files
-  --output-file OUTPUT_FILE
-                        Filepath for the output CSV file
+  -h, --help                         show this help message and exit
+  --input-dir INPUT_DIR              Directory to traverse for files
+  --output-file OUTPUT_FILE          Filepath for the output CSV file
+```
+
+### Python Package Usage
+```python
+from sumbuddy import get_checksums
+
+get_checksums("path/to/image/folder", "path/to/checksums.csv")
+
+# outputs status bar followed by
+# Checksums written to path/to/checksums.csv
 ```

src/sumbuddy/__init__.py

@@ -0,0 +1,3 @@
+from sumbuddy.__main__ import md5_checksum, get_checksums
+
+__all__ = ["md5_checksum", "get_checksums"]