requirements: Add initial version

Adds a "requirements.txt" to the project. This will not be used during a
standard installation however will be used to indicate which are known
working packages in cases of conflicts.

Update README and documentaion to reflect this.

requirements.txt

@@ -0,0 +1,22 @@
+certifi==2019.6.16
+chardet==3.0.4
+colorama==0.4.1
+enum34==1.1.6; python_version<"3"
+devlib==1.1.2
+future==0.17.1
+idna==2.8
+Louie-latest==1.3.1
+nose==1.3.7
+numpy==1.16.4
+pandas==0.24.2
+pexpect==4.7.0
+ptyprocess==0.6.0
+pyserial==3.4
+python-dateutil==2.8.0
+pytz==2019.1
+PyYAML==5.1.1
+requests==2.22.0
+six==1.12.0
+urllib3==1.25.3
+wlauto==3.1.4
+wrapt==1.11.2