Use atmos instead of makefile (#60)

* Added atmos readme

* Fix .gitignore entry for build-harness

Author: goruha

.gitignore

@@ -46,4 +46,5 @@ run.sh
 
 # Cloud Posse Build Harness https://github.com/cloudposse/build-harness
 **/.build-harness
-**/build-harness
+**/build-harness
+.atmos

Makefile

@@ -1,7 +1,7 @@
 ---
 #
 # This is the canonical configuration for the `README.md`
-# Run `make readme` to rebuild the `README.md`
+# Run `atmos readme` to rebuild the `README.md`
 #
 
 # Name of this project
@@ -65,7 +65,7 @@ description: |-
 
 # How to use this project
 usage: |-
-  This function should be deployed using the 
+  This function should be deployed using the
   [terraform-aws-github-action-token-rotator](https://github.com/cloudposse/terraform-aws-github-action-token-rotator.git)
   module.
 

README.md

@@ -0,0 +1,12 @@
+# Atmos Configuration — powered by https://atmos.tools
+#
+# This configuration enables centralized, DRY, and consistent project scaffolding using Atmos.
+#
+# Included features:
+# - Organizational custom commands: https://atmos.tools/core-concepts/custom-commands
+# - Automated README generation: https://atmos.tools/cli/commands/docs/generate
+#
+
+# Import shared configuration used by all modules
+import:
+  - https://raw.githubusercontent.com/cloudposse/.github/refs/heads/main/.github/atmos/default.yaml