Documentation updates

document/INSTALL_TEST.md

+# How to install the a test version of the observation app
+
+## Android
+
+### Change security settings to allow internal testing on your phone
+
+The default security settings on an Android smartphone do not allow test versions of an app to be installed. To allow for this, please follow these steps:
+
+1. Open Google Play on your Android Phone
+
+![Google Play icon](./images/google_play_icon.png "Google Play Icon")
+
+
+2. Click on your user icon on the top right to open your account menu
+3. Choose "Settings" ("Innstillinger")
+
+<img src="./images/android_allow_test_version_1.jpg" alt="Click user icon" width="250"/>
+
+4. Expand the "Info" menu item
+
+<img src="./images/android_allow_test_version_2.jpg" alt="Expand info menu item" width="250"/>
+
+5. Click the "Play store version" ("Play Butikk-versjon") 7 - seven - times
+
+<img src="./images/android_allow_test_version_3.jpg" alt="Click seven(!) times" width="250"/>
+
+6. Expand the "General" ("Generelt") menu item
+7. Enable "Internal app sharing" ("Intern appdeling")
+
+<img src="./images/android_allow_test_version_4.jpg" alt="Enable internal app sharing" width="250"/>
+
+
+### Install the test version using a link
+You will receive a link that you can go to on your smart phone to install the app. **This will be a new link for each new test version**
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