remove readme.md placeholder and add fish_powerline_ubuntu_the_easy_way.md

fish_powerline_ubuntu_the_easy_way.md

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+Tested on Ubuntu 17.04
+
+```bash
+apt install fish powerline
+```
+
+This pulls in fonts-powerline python-powerline python-psutil python3-powerline
+
+add the following lines to ~/.config/fish/config.fish
+
+```
+set fish_function_path $fish_function_path "/usr/share/powerline/bindings/fish"
+source /usr/share/powerline/bindings/fish/powerline-setup.fish
+powerline-setup
+```
+
+and then start a new instance of fish by typing `fish`
+
+Presumably if you have a different set up or distro, you can use grep/find
+to get the above information.
+
+```fish
+# these commands work with bash or fish
+cd /
+find -name fish 2>&1 | grep bindings
+# which returns
+./usr/share/powerline/bindings/fish
+# and then
+find -name '*.fish' 2>&1 | grep -e 'powerline-setup'
+# returns
+./usr/share/powerline/bindings/fish/powerline-setup.fish
+```

readme.md

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-#foo