feat(docs): add docs about new helpers

docs/getting-started/athennarc-file.mdx

@@ -239,6 +239,7 @@ resolve the paths of your application:
     "logs": "storage/logs",
     "tests": "tests",
     "stubs": "tests/stubs",
+    "fixtures": "tests/fixtures",
   }
 }
 ```

docs/the-basics/helpers.mdx

@@ -2338,6 +2338,22 @@ import { Is } from '@athenna/common'
 Is.Windows() // true
 ```
 
+#### `Is::Module()`
+
+Validate if a path or `File` instance is a module:
+
+```typescript
+import { Is, File } from '@athenna/common'
+
+Is.Module('./hello.js') // true
+Is.Module('./hello.ts') // true
+Is.Module('./hello.json') // false
+
+Is.Module(new File('./hello.js')) // true
+Is.Module(new File('./hello.ts')) // true
+Is.Module(new File('./hello.json')) // false
+```
+
 #### `Is::Uuid()`
 
 Validate if the value is a valid UUID v4:
@@ -3969,6 +3985,26 @@ import { Path } from '@athenna/common'
 Path.setStubs('stubs/app')
 ```
 
+#### `Path::fixtures()`
+
+Merge the project root path with `Path.dirs.fixtures`:
+
+```typescript
+import { Path } from '@athenna/common'
+
+console.log(Path.fixtures()) // /home/user/athenna-project/tests/fixtures
+```
+
+#### `Path::setFixtures()`
+
+Set the `Path.dirs.fixtures` value:
+
+```typescript
+import { Path } from '@athenna/common'
+
+Path.setFixtures('fixtures/app')
+```
+
 #### `Path::http()`
 
 Merge the project root path with `Path.dirs.http`: