Add some example .arclint files to un-lie the pending documentation

Summary: Ref T2039. Provide some examples to help users figure out how to write these things.

Test Plan: Checked them with `jsonlint`.

Reviewers: btrahan, joshuaspence

Reviewed By: joshuaspence

Subscribers: epriestley

Maniphest Tasks: T2039

Differential Revision: https://secure.phabricator.com/D9065

resources/arclint/cornucopia.arclint.example

@@ -0,0 +1,52 @@
+{
+  "linters": {
+    "pep8": {
+      "type": "pep8",
+      "include": "(\\.py$)",
+      "exclude": "(^exclude.py)",
+      "severity": {
+        "E401": "warning"
+      }
+    },
+    "flake8": {
+      "type": "flake8",
+      "include": "(\\.py$)",
+      "exclude": "(^exclude\\.py)",
+      "severity": {
+        "E901": "advice"
+      }
+    },
+    "csslint": {
+      "type": "csslint",
+      "include": "(\\.css$)"
+    },
+    "text": {
+      "type": "text",
+      "include": "(\\.txt$)"
+    },
+    "ruby": {
+      "type": "ruby",
+      "include": "(\\.rb$)"
+    },
+    "filename": {
+      "type": "filename"
+    },
+    "spelling": {
+      "type": "spelling"
+    },
+    "nolint": {
+      "type": "nolint"
+    },
+    "generated": {
+      "type": "generated"
+    },
+    "phpcs": {
+      "type": "phpcs",
+      "include": "(\\.php)",
+      "severity.rules": {
+        "(^PHPCS\\.E\\.)": "warning",
+        "(^PHPCS\\.W\\.)": "advice"
+      }
+    }
+  }
+}

resources/arclint/general-purpose.arclint.example

@@ -0,0 +1,22 @@
+{
+  "linters": {
+    "filename": {
+      "type": "filename"
+    },
+    "generated": {
+      "type": "generated"
+    },
+    "merge-conflict": {
+      "type": "merge-conflict"
+    },
+    "nolint": {
+      "type": "nolint"
+    },
+    "text": {
+      "type": "text"
+    },
+    "spelling": {
+      "type": "spelling"
+    }
+  }
+}

resources/arclint/include-exclude.arclint.example

@@ -0,0 +1,13 @@
+{
+  "exclude": [
+    "(^externals/)",
+    "(\\.example$)"
+  ],
+  "linters": {
+    "pep8": {
+      "type": "pep8",
+      "include": "(\\.py$)",
+      "exclude": "(^legacy/)"
+    }
+  }
+}