docs: create programmatic-access guide

usage-guides/programmatic-access.md

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+## Programmatic access of Whispr
+
+In addition to installing Whispr as a tool, one can make use of core utility functions like this:
+
+```bash
+pip install whispr
+```
+
+Then from Python code you can import important functions like this:
+
+```py
+from whispr.utils.vault import fetch_secrets
+from whispr.utils.process import execute_command
+
+config = {
+  "vault": "aws",
+  "secret_name": "<your_secret_name>"
+}
+
+secrets = fetch_secrets(config)
+
+# Now, inject secrets into your command's environment by calling this function
+command = "ls -l"
+execute_command(command.split(), no_env=False, secrets=secrets)
+```
+
+That's it. This is a programmatic equivalent to the tool usage.