doc: 6 installation steps for rapidpro cht apk (#550)

* doc: 6 installation steps for rapidpro cht apk

* Update content/en/apps/guides/messaging/gateways/rapidpro_cht_gateway.md

Co-authored-by: Samuel Mbuthia <1491710+smbuthia@users.noreply.github.com>

* fix: add front matter and index for resource folder

* fix: bad refs

* clean up PR for rapid pro apk install

---------

Co-authored-by: Samuel Mbuthia <1491710+smbuthia@users.noreply.github.com>
Co-authored-by: mrjones-plip <mrjones-plip@plip.com>

content/en/apps/guides/messaging/gateways/rapidpro_cht_gateway.md

@@ -0,0 +1,31 @@
+---
+title: Installing RapidPro - CHT Gateway Android APK
+linkTitle: "RapidPro Gateway Installation"
+weight: 20
+description: >
+    Integration for sending and receiving messages
+relatedContent: >
+    apps/guides/messaging/gateways/rapidpro
+---
+
+RapidPro - CHT uses your Android phone to send and receive messages on your behalf.
+
+Due to restrictions that Google has placed on Android applications that send SMS messages, RapidPro - CHT applications can no longer be distributed through the Google Play Store. You will need to download the application file and install it using the steps below:
+
+
+
+1. **Download App** -  On your Android device, open your browser and download the app by entering the URL: <code>[https://rapidpro.app.medicmobile.org/android/](https://rapidpro.app.medicmobile.org/android/)</code>
+
+2. **Launch the RapidPro - CHT installer** - Open the notifications shade by dragging from the top and select the downloaded file.
+   ![download](apk_download.png "image_tooltip")
+3. **Tap Settings** - You will be taken to a screen with "allow from this source" toggle
+   ![settings](apk_download_settings.png "image_tooltip")
+4. **Toggle allow from this source** - Make sure "allow from this source" toggle is in the On position. The go back and click install
+
+   ![Toggle allow from this source](apk_download_allow_install.png "image_tooltip")
+   ![Confirm Toggle allow from this source](apk_download_confirm_install.png "image_tooltip")
+5. **Open RapidPro - CHT** - Once RapidPro - CHT has been installed, open the app drawer and tap on the  RapidPro - CHT icon to start the app.
+   ![Open RapidPro - CHT](apk_download_start_app.png "image_tooltip")
+6. **Send Claim Code** -     When you first open RapidPro - CHT, the app will register your device with Google and our servers. Once that is complete, it will display a claim code. Copy that claim code in the form to the left and send it to your supporting engineers at Medic to connect your device.
+    ![Copy and Send Claim Code](apk_download_copy_claim.png "image_tooltip")
+