added guides for new methods

guide/features/export.md

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+[**» Back to Overview**](https://github.com/azurydev/cachu#features)
+
+## export()
+
+Export all records as a `.cachu` file.
+
+### Structure:
+
+```js
+export(path, key)
+```
+
+### Parameters:
+
+- `path` - the path of the directory the file should be put into
+- `key` - a 32-characters long key used to encrypt the data (required for importing)
+
+### Example:
+
+```js
+import { join } from 'path'
+
+await cache.export(join(__dirname, '../directory'))
+```

guide/features/import.md

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+[**» Back to Overview**](https://github.com/azurydev/cachu#features)
+
+## import()
+
+Import records from a `.cachu` file.
+
+### Structure:
+
+```js
+import(path, key)
+```
+
+### Parameters:
+
+- `path` - the path of the file
+- `key` - the 32-characters long key used to export the data
+
+### Example:
+
+```js
+import { join } from 'path'
+
+await cache.import(join(__dirname, './path/to/the/file.cachu'))
+```