Add tidbits from installation session with Claude.

README.md

@@ -9,7 +9,7 @@ Only the php vendors are not included.
 ## Run locally for fast development
 
 PHP `7.1` (or above) is recommended.  Do tell us what works or not for you.
-
+Apparently, PHP `5.6` works as well. To confirm by @cmeny.
 
 Clone this repository:
 
@@ -26,6 +26,13 @@ Install the dependencies:
 	bin/grav install
 
 
+If it complains that you do not have `bin/composer.phar`, try installing it by hand :
+
+    cd bin
+    curl -sS https://getcomposer.org/installer | php
+    cd ..
+
+
 Add the courses from the other repository, if you did not use `git clone --recursive`:
 
 	bin/clone_courses.sh