Project requirement in README.md updated

README.md

 # Requirements
 - Visualize statistical data from Statistikdatbasen.scb.se focusing on European Parliamental Election data.
-- The data contains geographical information and thus can be vizualized on the map
+- The data contains geographical information and thus can be represented on the map
 
 - D3 library will be used for graphical visalization
+- Here the goal would be to project a map of Sweden using topoligical data.
+
+# D3 mapping concepts
+The 3 concepts that are key to understanding map creation using D3 are:
+
+- GeoJSON (a JSON-based format for specifying geographic data)
+- projections (functions that convert from latitude/longitude co-ordinates to x & y co-ordinates)
+- geographic path generators (functions that convert GeoJSON shapes into SVG or Canvas paths)
+
 - **Frontend:** React , **Backend:** SQLAlchemy
 
 - Dataman.se for topological data of sweden borders
@@ -17,6 +26,7 @@
 - Allows for focusing in on specific region for more fine detailed data
 
 ## IDEA2:
+- TBD
 
 ## ADVANDCED:
 - Optional parameters?
@@ -25,11 +35,10 @@
 - Graphical transitions of the visalization frame
 
 ## Profile
-- Log in / Sign out
+- Sign in / Sign out with "forget password? procedure
+- User profile (Name, e-mail, password)
 - Session token for saving log-in state locally
 - Access to key features through log-in.
-- User profile (Name, e-mail, password)
-- Session token
-- 
+