Add dependabot (#52)

## Description

To keep pip dependencies up to date.

- [ ] Breaking change?
  - Will this change break pre-existing builds or functionality without action being taken?
  **No**

## How This Was Tested

Confirmed file matches contents of the file working in other repos.

## Integration Instructions

N/A - Only updates this repo

Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>

.github/dependabot.yml

@@ -0,0 +1,19 @@
+## @file
+# Dependabot configuration file to enable GitHub services for managing and updating
+# dependencies.
+#
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+##
+version: 2
+updates:
+  - package-ecosystem: "pip" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "daily"
+    commit-message:
+      # Prefix all commit messages with "pip"
+      prefix: "pip"