feat: add readme content

Add a concise description of the services provided by ProFUSION,
as well as links and emails for contacts.

Closes #5

README.md

@@ -11,4 +11,6 @@
 
 Our developers build products that run on smartphones, internet tablets, TVs, media centers and infotainment systems.
 
-We are really full stack: mobile & web applications, servers, cloud computing platforms; low-level developments such as WebKit, Linux Kernel and userspace.
+We are really full stack: mobile & web applications, servers, cloud computing platforms; low-level developments such as WebKit, Linux Kernel and userspace.
+
+We're flexible to our customer's needs. Software development contracts are usually about time & materials (if open scope, then a team is allocated to work on tasks defined as the project evolves) or closed scope (if requirements are well defined and will not change during the project execution).