Added base Conda environment yml file

CONTRIBUTING.md

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+# Contributing to Streamz
+
+## Streamz Conda Environment
+For the convenience of the community streamz offers an environment file for contributors to create conda environments. A few basic quick start commands for creating a using a streamz conda environment are found below.
+
+### Creating Conda Development Environment
+Creating the streamz conda environment can be achieved by simply running ```conda env create -f ./conda/environments/streamz_dev.yml```
+
+### Using Conda Environment
+The streamz conda environment can be activated by running ```conda activate streamz_dev```

conda/environments/streamz_dev.yml

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+name: streamz_dev
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+  - python>=3.7
+  - pytest
+  - flake8
+  - black
+  - isort
+  - tornado
+  - toolz
+  - zict
+  - six
+  - librdkafka=1.2.2
+  - dask
+  - distributed
+  - pandas
+  - python-confluent-kafka=1.1.0
+  - numpydoc
+  - sphinx
+  - sphinx_rtd_theme