Addition of Dockerfile to allow container usage & added brief usage instructions to README.

Dockerfile

@@ -0,0 +1,8 @@
+FROM python:3.8.0-alpine3.10
+
+RUN mkdir /spraying && \
+    apk add cmake make libtool gcc musl-dev libffi-dev g++ libxml2 libxml2-dev libxslt libxslt-dev openssl openssl-dev
+
+COPY . /spraying
+
+RUN pip install -r /spraying/requirements.txt

README.md

@@ -161,3 +161,17 @@ Reads names from `names.txt`, `--target` dynamically grabs the internal domain n
 ```bash
 ./spindrift.py names.txt --target contoso.com
 ```
+
+## Docker
+
+Build the Docker container
+
+```bash
+docker build -t sprayingtoolkit .
+```
+
+Run the docker container with a specific tool
+
+```bash
+docker run -t sprayingtoolkt /spraying/<tool> <args>
+```