Add more FAQs in README.md

Closes #155, closes #121, closes #20

README.md

@@ -57,3 +57,27 @@ Thanks to youtube-dl authors for creating such an amazing tool.
  * **The website I'm trying to download from is not supported**: youtube-dl-gui uses [youtube-dl](https://github.com/rg3/youtube-dl) in the backend to download files. youtube-dl provides a list of [extractors](https://github.com/rg3/youtube-dl/tree/master/youtube_dl/extractor) to work with each particular site. If you'd like to request support for a new website, please submit it to youtube-dl's [issue tracker](https://github.com/rg3/youtube-dl/issues).
  
  * **How do I change the naming pattern for downloaded files?**: See [this comment](https://github.com/MrS0m30n3/youtube-dl-gui/issues/144#issuecomment-263195019)
+ 
+ * **When is the next release coming?**: youtube-dl-gui does not have a release schedule, next release will come when it's ready.
+ 
+ * **How can i log the youtube-dl debug output**: Just go to Options>Extra tab and enable the **Debug youtube-dl** option.
+ 
+ * **I don't see my language in the available subtitles languages**: You can't see it because it's not there, feel free to open a new pull-request and add support for your language (it's literally one line of code you don't need years of experience).
+ 
+ * **I'm on OS-X and i get 'No module named wx' error**: You need to install wxPython. If you have [homebrew](https://brew.sh/) installed you can just run: `brew install wxpython`
+ 
+ * **Is there an option to change the maximum parallel downloads**: You can change the number of max parallel downloads by editing the 'workers_number' option in your settings.json file (~/.config/youtubedlg/settings.json). Note that you need to restart youtube-dl-gui for the changes to take place.
+ 
+ * **Not all formats reported by youtube-dl -F are available in youtube-dl-gui**: Unfortunately it is not possible to support all the video formats that youtube-dl provides. If you want to use a "custom" format you can follow this steps:
+   1. Set the download format to *default*
+   2. Go to Options>Extra tab
+   3. Add `-f your_custom_format` in the commands box
+   4. Download your video as you would normally do
+   
+ * **How can i use a youtube-dl option that's not available in youtube-dl-gui**: You can add extra youtube-dl command line options in the commands box under the Options>Extra tab.
+ 
+ * **Can i download only the subtitles file**: If the video file is presented youtube-dl-gui will go ahead and download only the subtitles file else you will have to use youtube-dl or a different tool since youtube-dl-gui can't download only subtitles.
+ 
+ * **I'm using the HLS downloader and i don't see any progress report**: That's a known issue you should use the native HLS implementation by enabling the **Prefer Native HLS** option under the Options>Extra tab. Note that the native HLS implementation might not work on every site. For more info you can read issue #49.
+ 
+ * **I'm using the HLS downloader and the Stop button won't work**: That's also a known issue with the HLS downloader on Windows. You should use the native HLS implementation or wait for the download to complete normally. For more info you can read issue #49.