Added Dockerfile for nginx-ldap-auth-daemon.py.

Dockerfile

@@ -0,0 +1,16 @@
+FROM python:2-alpine
+
+COPY nginx-ldap-auth-daemon.py /usr/src/app/
+
+WORKDIR /usr/src/app/
+
+# Install required software
+RUN \
+    apk --no-cache add openldap-dev && \
+    apk --no-cache add --virtual build-dependencies build-base && \
+    pip install python-ldap && \
+    apk del build-dependencies
+
+EXPOSE 8888
+
+CMD ["python", "/usr/src/app/nginx-ldap-auth-daemon.py", "--host", "0.0.0.0", "--port", "8888"]

README.md

@@ -38,6 +38,14 @@ To install and configure the reference implementation, perform the following ste
 1. Copy the following files from your repository clone to the indicated hosts:
     - **nginx-ldap-auth.conf** – NGINX Plus configuration file, which contains the minimal set of directives for testing the reference implementation. Install on the NGINX Plus host (in the **/etc/nginx/conf.d** directory if using the conventional configuration scheme). To avoid configuration conflicts, remember to move or rename any default configuration files installed with NGINX Plus.
     - **nginx-ldap-auth-daemon.py** – Python code for the ldap-auth daemon. Install on the host of your choice.
+
+      Alternatively, use provided Dockerfile to build Docker image:
+
+      ```
+      docker build -t nginx-ldap-auth-daemon .
+      docker run nginx-ldap-auth-daemon
+     ```
+
     - **nginx-ldap-auth-daemon-ctl.sh** – Sample shell script for starting and stopping the daemon. Install on the same host as the ldap-auth daemon.
     - **backend-sample-app.py** – Python code for the daemon that during testing stands in for a real back-end application server. Install on the host of your choice.