renaming readme so that github pages serves index.html from root

README.txt

@@ -0,0 +1,10 @@
+Installation
+
+1. brew install mkdocs
+2. pip install mkdocs-material
+3. pip install fontawesome_markdown
+
+To build, navigate to the root of this repo and run:
+    mkdocs build --clean
+
+Note that the readme has been renamed to README.txt to prevent github pages from considering it to be the index by default!