Create BUILD.md

BUILD.md

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+# Electron application
+
+- Install yarn - https://yarnpkg.com/lang/en/docs/install/
+- Install node v8.x (check with `node --version`) - https://nodejs.org/en/
+- Then run these commands:
+
+```
+cd ElectronClient/app
+rsync -a ../../ReactNativeClient/lib/ lib/
+npm install
+yarn dist
+```
+
+If there's an error `while loading shared libraries: libgconf-2.so.4: cannot open shared object file: No such file or directory`, run `sudo apt-get install libgconf-2-4`
+
+That will create the executable file in the `dist` directory.
+
+From `/ElectronClient` you can also run `run.sh` to run the app for testing.
+
+# Mobile application
+
+From `/ReactNativeClient`, run `npm install`, then `react-native run-ios` or `react-native run-android`.
+
+# Terminal application
+
+From `/CliClient`, run `npm install` then run `run.sh`. If you get an error about `xgettext`, comment out the command `node build-translation.js --silent` in build.sh