fix spelling mistakes, update flask-sqlachemy doc line, changed how to run to ref main.py instead of book.py && testing first real commit

README

@@ -1,7 +1,7 @@
 ## TODO: get all this inside a docker container and use compose to do the whole set (pg, flask, ?)
-# flash -> python web server
+# flask -> python web server
 # sqlalchemy -> provides db-agnostic python objects of db content (and more)
-## LEARN: not totally sure what flask-sqlachemy provides
+## flask-sqlachemy combines/wraps this to provide a db.* set of objects based on the 'app' that flask creates
 
 # --user sticks python libs in ~/.local/[bin|lib|share]
 ##LEARN: supposedly could use virtualenv instead?
@@ -9,4 +9,4 @@ sudo apt install python3-psycopg2 libpq-dev
 pip3 install --user flask sqlalchemy flask-sqlalchemy 
 
 # run the web server by:
-python3 book.py
+python3 main.py