Add default Cleanthat configuration

.cleanthat/cleanthat.yaml

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+syntax_version: "2023-01-09"
+meta:
+  labels:
+  - "cleanthat"
+  refs:
+    protected_patterns:
+    - "refs/heads/develop"
+    - "refs/heads/main"
+    - "refs/heads/master"
+    excluded_patterns:
+    - "refs/heads/release/*"
+  full_clean_on_configuration_change: false
+  can_edit_not_protected_branches: true
+source_code:
+  encoding: "UTF-8"
+  line_ending: "GIT"
+engines:
+- engine: "spotless"
+  skip: false
+  source_code: {}
+  steps:
+  - id: "spotless"
+    skip: false
+    parameters:
+      configuration: "repository:/.cleanthat/spotless.yaml"

.cleanthat/spotless.yaml

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+syntax_version: "2023-01-09"
+encoding: "UTF-8"
+git:
+  core_eol: "native"
+line_ending: "GIT_ATTRIBUTES"
+formatters:
+- format: "markdown"
+  steps:
+  - id: "flexmark"
+    skip: false
+    parameters:
+      version: "0.64.8"
+  - id: "freshmark"
+    skip: false
+    parameters:
+      properties:
+        k1: "v1"