Add FAQ for questions

README.md

@@ -13,7 +13,7 @@
 
 Tesseract.js is a javascript library that gets words in [almost any language](./docs/tesseract_lang_list.md) out of images. ([Demo](http://tesseract.projectnaptha.com/))
 
-[![fancy demo gif](./docs/demo.gif)](http://tesseract.projectnaptha.com)
+[![fancy demo gif](./docs/images/demo.gif)](http://tesseract.projectnaptha.com)
 
 Tesseract.js works with script tags, [webpack](https://webpack.js.org/), and [Node.js](https://nodejs.org/en/). [After you install it](#installation), using it is as simple as
 
@@ -80,6 +80,7 @@ or
 * [Image Format](./docs/image-format.md)
 * [API](./docs/api.md)
 * [Local Installation](./docs/local-installation.md)
+* [FAQ](./docs/faq.md)
 
 # Contributing
 

docs/faq.md

@@ -0,0 +1,8 @@
+FAQ
+===
+
+## How does tesseract.js download and keep \*.traineddata?
+
+When you execute recognize() function (ex: `recognize(image, 'eng')`), the language model to download is determined by the 2nd argument of recognize(). (`eng` in the example)
+
+Tesseract.js will first check if \*.traineddata already exists. (browser: [IndexedDB](https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API), Node.js: fs, in the folder you execute the command) If the \*.traineddata doesn't exist, it will fetch \*.traineddata.gz from [tessdata](https://github.com/naptha/tessdata), ungzip and store in IndexedDB or fs, you can delete it manually and it will download again for you.