add docs for nightly (#1050)

README.md

@@ -84,7 +84,9 @@ The best way to report an issue is to create a Github Issue for the project. Ple
 
 ## Contributing
 
-This is a Golang project. You can find the build instructions of the project in the [Developer Guide](docs/developers/developer-guideline.md).
+* [Developer Guide](docs/developers/developer-guideline.md)
+* [Installing the latest nightly build](./docs/developers/nightly.md)
+
 
 This project welcomes contributions and suggestions.  Most contributions require you to agree to a
 Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us

docs/developers/developer-guideline.md

@@ -4,5 +4,6 @@ Welcome to the Application Gateway Ingress Controller development guide!
 ## Table of contents
 - [Understanding the architecture](design.md)
 - [Building and running the controller](build.md)
+- [Installing the latest nightly build](nightly.md)
 - [Running tests](test.md)
 - [Contribution Guidelines](contribute.md)

docs/developers/nightly.md

@@ -0,0 +1,28 @@
+# Install the latest nightly build
+
+To install the latest nightly release,
+
+1. Add the nightly helm repository
+    ```
+    helm repo add agic-nightly https://appgwingress.blob.core.windows.net/ingress-azure-helm-package-staging/
+    helm repo update
+    ```
+
+2. Check the available version
+
+    **Latest version**: ![nightly release (latest by date)](https://img.shields.io/badge/dynamic/yaml?url=https://appgwingress.blob.core.windows.net/ingress-azure-helm-package-staging/index.yaml&label=nightly&query=entries[%22ingress-azure%22][0].appVersion&color=green)  
+
+    or  
+
+    You can look up the version in the repo using helm.
+    ```
+    helm search repo agic-nightly
+    ```
+
+2.  Install using the same helm command by using the staging repository.
+    ```
+    helm install ingress-azure \
+      -f helm-config.yaml \
+      agic-nightly/ingress-azure \
+      --version <version>
+    ```