some language docs

docs/00_Overview.md

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+# Overview
+Noja is a high level programming language implemented as a learning exercise. Still, it aims to be a non-trivial example of how a language may be built. 
+
+The use-cases of Noja are the same as Python since their abstraction level is comparable. The syntax is more similar to the C-family of languages though (curly brackets to denote scope).
+
+## A Noja program
+A Noja program is a sequence of statements separated by semi-colons (with some exceptions). The statements can be o various kinds: 
+* expressions
+* function definitions
+* if-else branches
+* while loops 
+* do-while loops
+* compound statements
+* `break` jumps
+* `return` statements
+
+(You may note that there is no import statement! This is because the ability to import other files is exposed through a built-in function.)
+
+Whitespace doesn't matter.
+Comments starts with `#` and end with the line.
+
+## Notable features
+* No exceptions