Add Dependabot configuration

Add configuration for Dependabot to automatically update dependencies,
if possible. Updates are currently managed Cargo.toml based Rust
dependencies.

Signed-off-by: Daniel Müller <[email protected]>

Author: d-e-s-o

.github/dependabot.yml

@@ -0,0 +1,10 @@
+# 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: cargo
+    versioning-strategy: auto
+    directory: examples/rust/
+    schedule:
+      interval: daily