doc: add minimal info and structure to readme.md

README.md

@@ -1,3 +1,19 @@
-# heave
+# heave 󱅝
 
-A Rust EAV data model implementation
+A Rust EAV data model implementation
+
+## EAV
+
+Learn more on EAV data model [here](https://en.wikipedia.org/wiki/Entity%E2%80%93attribute%E2%80%93value_model).
+
+## Project Structure
+
+...
+
+## Example
+
+...
+
+## Credits
+
+- **Project Icon:** by [SmashIcons](https://www.flaticon.com/authors/smashicons)