feat(docker): created dockerfile for sdk

Author: kingsodigie

docker/Dockerfile

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+# Import .NET SDK base image (change version as needed)
+FROM mcr.microsoft.com/dotnet/core/sdk:2.2
+
+#Set working directory to src
+WORKDIR /src
+
+# Create new .net project (console project, change as needed)
+RUN dotnet new console
+
+# Install SDK packages
+RUN dotnet add package IBM.Watson.SpeechToText.v1 --version 3.3.0 && \
+    dotnet add package IBM.Cloud.SDK.Core --version 0.8.2 && \
+    dotnet add package IBM.Watson.TextToSpeech.v1 --version 3.3.0 && \
+    dotnet add package IBM.Watson.NaturalLanguageUnderstanding.v1 --version 3.3.0 && \
+    dotnet add package IBM.Watson.VisualRecognition.v3 --version 3.3.0 && \
+    dotnet add package IBM.Watson.NaturalLanguageClassifier.v1 --version 3.3.0 && \
+    dotnet add package IBM.Watson.Discovery.v1 --version 3.3.0 && \
+    dotnet add package IBM.Watson.LanguageTranslator.v3 --version 3.3.0 && \
+    dotnet add package IBM.Watson.PersonalityInsights.v3 --version 3.3.0 && \
+    dotnet add package IBM.Watson.ToneAnalyzer.v3 --version 3.3.0 && \
+    dotnet add package IBM.Watson.CompareComply.v1 --version 3.3.0 && \
+    dotnet add package IBM.Watson.Common --version 3.0.1 && \
+    dotnet add package IBM.Watson.Assistant.v1 --version 3.3.0 && \
+    dotnet add package IBM.Watson.Assistant.v2 --version 3.3.0 

docker/README.md

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+## Docker
+You can use docker to test issues you have with the SDK.
+
+1.  Install docker
+    -   Mac: <https://docs.docker.com/docker-for-mac/install/>
+    -   Windows: <https://docs.docker.com/docker-for-windows/install/>
+
+2.  Download the dockerfile for this SDK and edit as needed.
+    -   Change the .net version as needed `FROM mcr.microsoft.com/dotnet/core/sdk:<your-version>`
+        -   For valid .net base images on docker see <https://hub.docker.com/_/microsoft-dotnet-core-sdk/>
+
+    -   Copy code/project that you wish to test into the dockerfile 
+        -   Add line `COPY <src>... <dest>`
+
+    -   Set dockerfile to execute code file 
+        -   Add line `CMD [ "<executable>" ]`
+    
+    -   For more information on dockerfile construction please visit <https://docs.docker.com/engine/reference/builder/>
+
+3.  Build and run the docker image.
+    -   Navigate to docker file directory
+    -   To build the docker image run `docker build --tag=<your-tag> .`
+    -   To run the docker image run `docker run <your-tag>`