[doc] Provide a simple introduction of the library

README.md

@@ -6,7 +6,15 @@ A Golang library to make development easier and more efficient
 
 ## Features
 
-1. Provide a series of functions with `JavaScript` style.
-2. Provide a series of functions with `Python` style.
-3. Provide a series of `Data Structure`.
-4. Improve the support for `OOP` and `FP` in `Golang`.
+1. `itertools` provide a series of functions to create iterators.
+2. `functools` provide a series of functions to support functional programming.
+3. `collections` provide a series of powerful and practical containers to store and manipulate data.
+4. `typed` provide `itertools`, `functools` and `collections` with `generics` support.
+5. This library mainly refers to `Python` and `JavaScript`, considering the feature of `Golang` as well.
+
+## ToDo List
+
+1. Robustness: Add fuzz tests to ensure the robustness of the library.
+2. Maintainability: Add annotations to the code to make it more readable; standardize the naming of the functions and variables to make it more consistent.
+3. Provide more practical functions in `functools` for manipulating `sequences` (`slice`/`array`/`string`).
+4. Generate documentation for the library and provide examples for each function.