[WIP]Added text to speech instructions

content/text-to-speech.md

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+---
+title: "Text-to-speech output on Android"
+description: "No tracking, no ads, no data collection, no spyware"
+page_template: index.html
+weight: 900
+---
+Organic Maps uses the system text-to-speech(TTS) engine for voice instructions. The default engines vary by device. The choices can include Google Text-to Speech, device manufacturer's engine or a third-party one. 
+
+You can use a third-party Text-to-speech engine which can be downloaded from Google Play or F-Droid. 
+
+[RHVoice](https://rhvoice.org/) is a free and open source speech engine which can be downloaded from [Google Play](https://play.google.com/store/apps/details?id=com.github.olga_yakovleva.rhvoice.android) and [F-Droid](https://f-droid.org/en/packages/com.github.olga_yakovleva.rhvoice.android/).
+
+## Instructions
+
+1. Open the Settings app on your Android device.
+2. Select Additional Settings and then select Accessibility.
+3. Choose your preferred engine, speech rate and pitch.
+
+If you cannot find the setting, open the settings app and search for Text-to-speech.
+
+The option may not appear if you don't have a TTS installed on your device. Please install Google Speech Services from the [Play Store](https://play.google.com/store/apps/details?id=com.google.android.tts), which is used by many devices or you can install a third party one such as [RHVoice](https://play.google.com/store/apps/details?id=com.github.olga_yakovleva.rhvoice.android)
+
+## Screenshots
+
+{{ screenshot(src='images/screenshots/setting1.jpg') }}
+{{ screenshot(src='images/screenshots/setting2.jpg') }}
+{{ screenshot(src='images/screenshots/setting3.jpg') }}
+
+## Workaround to make RHVoice TTS engine work on Lineageos (degoogled custom rom)
+
+Often RHVoice doesn't get initialized properly and app itself might be crashing. Mostly in cases where you haven't used any TTS engine on your phone yet (new installations etc)
+
+If you use custom rom like Lineageos without Google Play services & Speech Services by Google and want to use RHVoice as your preferred TTS engine, please follow workaround instructions below:
+
+1) Install [eSpeak TTS engine](https://f-droid.org/en/packages/com.reecedunn.espeak) available on F-Droid
+
+2) Set it as the preferred engine
+
+      a) Go to Lineage os main **Settings**.
+
+      b) Scroll down to **Accessibility**.
+
+      c) Select **text-to-speech output** (below SCREEN READERS) and **Preferred engine** (left side) and make sure **eSpeak** is selected.
+
+3) Go back and press **play** to see if it's working
+4) Install [RHVoice](https://f-droid.org/en/packages/com.github.olga_yakovleva.rhvoice.android/) available on F-droid.
+a) Open it, select the language you want to use, tap on the cloud icon (far left) to download voices.
+b) Press play button to verify if it's working
+5) Set **RHVoice** as preferred engine (see step 2)
+6) Now, you should be able to use RHVoice without any problems
+
+*In order to hear voice instructions you have to actually move around to receive any voice output, OrganicMaps will not give you any voice institutions while you're still.*