Merge pull request #202 from jenshnielsen/condaforge_readme

clarify install instructions wrt qt and mention conda forge

README.md

@@ -18,10 +18,18 @@ https://plottr.readthedocs.io (work in progress...)
 
 Plottr is installable from pypi with `pip install plottr`
 
-To install with either PyQt5 or Pyside2 backend you can do
-``pip install plottr[PyQt5]`` or ``pip install plottr[Pyside2]`` Note that if 
-you have installed ``pyqt`` from ``(Ana)Conda`` you should not use any of these
-targets but do ``pip install plottr`` 
+Plottr requires either the PyQt5 or Pyside2 gui framework.
+To install with PyQt5 or Pyside2 backend you can do
+``pip install plottr[PyQt5]`` or ``pip install plottr[Pyside2]`` 
+
+Note that if  you have installed ``pyqt`` from ``(Ana)Conda`` you should not use any of these
+targets but do ``pip install plottr`` or install Plottr from conda forge:
+
+```
+conda config --add channels conda-forge
+conda config --set channel_priority strict
+conda install plottr
+```
 
 To install from source: clone the repo, and install using `pip install -e .`