doc: modify the README file of the rust-library project

Author: android10

rust-library/README.md

@@ -1,16 +1,53 @@
-## Rust Everywhere: Crypto Library
+## Rust Crypto Library
 
-**Crypto** is a sample Rust Library that showcases cross-platform compilation for different projects and environments.
+**Crypto** is a sample **Rust Library** that showcases **cross-platform compilation for different projects and environments**. In terms of functinality it only simulates **'encryption/decryption'** by using `base64 encoding/decoding`. This is just for **LEARNING PURPOSE**. 
+
+In order to fully understand the purpose of this repo, please refer to the follwing blog posts:
+
+ - **TODO:** Blog Post one
+ - **TODO:** Blog Post two
+ - **TODO:** Blog Post three
 
 ## Local Development
 
- - `cargo build`
- - `cargo test`
+ - `cargo build` -> builds the entire project.
+ - `cargo test`  -> run all the tests.
+
+## Sub-projects
+
+The Crypto Library is composed by a [Rust Workspace](https://doc.rust-lang.org/book/ch14-03-cargo-workspaces.html) containing a set of crates (listed below).
+### cryptor
+
+It is the core domain library, which contains the main logic for **encryption/decryption.**
+
+**Available commands:**
 
-### Bumping dependencies
+```bash
+$ cargo build               //build the debug version of the project.
+$ cargo build --release     //build the release version of the project.
+$ cargo test                //run all the tests.
+```
+### cryptor_jni
 
- - `cargo update`
+This crate fully depends on the `crypto` crate and its main purpose is to act as a proxy between Rust and Android (Java/Kotlin) via JNI.  
+
+**Available commands:**
+
+```bash
+$ cargo build                   //build the debug version of the project.
+$ cargo build --bin release     //build the release version of the project for all android targets.
+$ cargo build --bin publish     //copy all the released libraries/crates inside the android project.
+$ cargo test                    //run all the tests.
+```
+
+### cryptor_c
+
+Still a TODO
 
 ## Rust Useful References
 
- - [Transition a project to a new Rust Edition](https://doc.rust-lang.org/edition-guide/editions/transitioning-an-existing-project-to-a-new-edition.html)
+ - [Transition a project to a new Rust Edition](https://doc.rust-lang.org/edition-guide/editions/transitioning-an-existing-project-to-a-new-edition.html)
+
+![https://fernandocejas.com](https://github.com/android10/Sample-Data/blob/master/android10/android10_logo_big.png)
+
+<a href="https://www.buymeacoffee.com/android10" target="_blank"><img src="https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png" alt="Buy Me A Coffee" style="height: auto !important;width: auto !important;" ></a>