docs: add README for every chapters

README.md

@@ -14,7 +14,7 @@ Rust keeps track of who can read and write to memory. It knows when the program
 
 - [Website](https://www.rust-lang.org/)
 - Local Documentation: `rustup doc`
-- Rust version used: v1.74.0 (`rustc --version`)
+- Rust version used: v1.75.0 (`rustc --version`)
 
 ## Summary
 
@@ -31,3 +31,4 @@ Rust keeps track of who can read and write to memory. It knows when the program
 11. [Testing](./chapter_11_testing)
 12. [An I/O Project: Building a Command Line Program: `minigrep`](./chapter_12_minigrep)
 13. [Functional Language Features: Iterators and Closures](./chapter_13_iterators_and_closures)
+14. [More About Cargo and Crates.io](./chapter_14_cargo_and_crates)

chapter_10_generics_traits_lifetimes/README.md

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+# 10. Generic Types, Traits, and Lifetimes

chapter_12_minigrep/README.md

@@ -1,4 +1,4 @@
-# An I/O Project: Building a Command Line Program: `minigrep`
+# 12. An I/O Project: Building a Command Line Program: `minigrep`
 
 Command line tool that interacts with file and command line input/output to practice some of the Rust concepts we've learned so far.
 

chapter_13_iterators_and_closures/README.md

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+# 13. Functional Language Features: Iterators and Closures

chapter_14_cargo_and_crates/README.md

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+# 14. More About Cargo and Crates.io
+
+## Customizing Builds with Release Profiles
+
+=> Release profiles are predefined and customizable profiles with different configurations that allow a programmer to have more control over various options for compiling code.
+
+Cargo has 2 main profiles:
+
+- `dev`: for development (used by default with `cargo build`)
+- `release`: for release (used with `cargo build --release`)
+
+We can customize the `release` profile by adding a section to the `Cargo.toml` file:
+
+```toml
+[profile.dev]
+opt-level = 0
+
+[profile.release]
+opt-level = 3
+```
+
+## Publishing a Crate to Crates.io
+
+Packages can be published to [crates.io](https://crates.io/), the Rust community’s package registry.

chapter_2_guessing_game/README.md

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+# 2. Programming a Guessing Game

chapter_3_common_concepts/README.md

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+# 3. Common Programming Concepts

chapter_4_ownership/README.md

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+# 4. Understanding Ownership

chapter_5_structs/README.md

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+# 5. Using Structs to Structure Related Data

chapter_6_enums/README.md

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+# 6. Enums and Pattern Matching

chapter_8_common_collections/README.md

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+# 8. Common Collections

chapter_9_error_handling/README.md

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+# 9. Error Handling