Add location-based READMEs

Author: nickw1

aframe/src/location-based/README.md

@@ -0,0 +1,5 @@
+# Original location-based components
+
+These are the original location-based components, developed in 2020 or before. Please note that new location-based A-Frame components, wrapping the three.js location-based API, are available [here](../new-location-baseD). 
+
+The new components are likely to see more active development and bug-fixes so it is recommended to try these first, and if they do not work for you, try these original components instead.

aframe/src/new-location-based/README.md

@@ -0,0 +1,7 @@
+# New location-based components
+
+These are new location-based components, which aim to solve outstanding issues such as #278. 
+
+The new components wrap the three.js API and are internally simpler and thus easier to maintain and debug. Thus, they are likely to see more active development and bug-fixes so it is recommended to try them first, and if they do not work for you, try [the original components](../location-based) instead.
+
+Please see [the example](../../examples/new-location-based) to see how to use these components.