Improve GitHub Actions flow and increse Cmake version

- Increased CMake minimum version to 3.30
- added test run in github workflow

Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>

README.md

@@ -1,10 +1,17 @@
 # Blowfish and Blowfish2 Encryption Algorithm
 
-<p align=center><a href="https://github.com/avinal/blowfish/actions"><img alt="build" src="https://github.com/avinal/blowfish/workflows/build/badge.svg?branch=main"></a><a href="https://github.com/avinal/blowfish/blob/main/LICENSE"><img src="https://img.shields.io/github/license/avinal/blowfish" alt="license"></a></p>
+[![Build Status](https://github.com/avinal/blowfish/actions/workflows/cmake.yml/badge.svg)](https://github.com/avinal/blowfish/actions/workflows/cmake.yml)
 
-Blowfish is a symmetric block cipher that can be used as a drop-in replacement for DES or IDEA. It takes a variable-length key, from 32 bits to 448 bits, making it ideal for both domestic and exportable use. Blowfish was designed in 1993 by Bruce Schneier as a fast, free alternative to existing encryption algorithms. Since then it has been analyzed considerably, and it is slowly gaining acceptance as a strong encryption algorithm. Blowfish is unpatented and license-free, and is available free for all uses.
+Blowfish is a symmetric block cipher that can be used as a drop-in replacement for DES or IDEA. It
+takes a variable-length key, from 32 bits to 448 bits, making it ideal for both domestic and
+exportable use. Blowfish was designed in 1993 by Bruce Schneier as a fast, free alternative to
+existing encryption algorithms. Since then it has been analyzed considerably, and it is slowly
+gaining acceptance as a strong encryption algorithm. Blowfish is not patented and license-free,
+and is available free for all uses.
 
-Blowfish 2 was released in 2005. It has exactly the same design but has twice as many S tables and uses 64-bit integers instead of 32-bit integers. It no longer works on 64-bit blocks but on 128-bit blocks like AES. 128-bit block, 64 rounds, key up to 4224 bits.
+Blowfish 2 was released in 2005. It has exactly the same design but has twice as many S tables and
+uses 64-bit integers instead of 32-bit integers. It no longer works on 64-bit blocks but on 128-bit
+blocks like AES. 128-bit block, 64 rounds, key up to 4224 bits.
 
 ## About this project
 
@@ -12,8 +19,12 @@ This is a C++ implementation of the encryption algorithm.
 
 ## How to use this in your project?
 
-1. You may fork it and use it like any other source file in your project. You only need [blowfish.hpp](include/blowfish/blowfish.hpp) and [blowfish.cpp](src/blowfish.cpp) files. Just modify the header as per your convienence. 
-2. If you are using CMake, the work is lot easier. You can add this as a git submodule. It isolates your project from this dependency.
+1. You may fork it and use it like any other source file in your project. You only need
+[blowfish.hpp](include/blowfish/blowfish.hpp) and [blowfish.cpp](src/blowfish.cpp) files. Just
+modify the header as per your convenience.
+
+2. If you are using CMake, the work is lot easier. You can add this as a git submodule. It isolates
+your project from this dependency.
 
   ```bash
     # In your project root type these commands
@@ -21,9 +32,37 @@ This is a C++ implementation of the encryption algorithm.
     # considering this addition is your only change
     git commit -m "blowfish submodule added"
     git push origin main
- ```
+  ```
 
- Add this to your CMakeLists.txt as well.
+Add this to your CMakeLists.txt as well.
+
+## Building
+
+This library has no dependencies on any other code. Just a C++ compiler should be enough to build
+this. Although this library is supposed to be used under some other project, sometimes you may need
+to build this. Here are the prerequisites:
+
+- [CMake](https://cmake.org/download/)
+- [G++](https://gcc.gnu.org/) or [Clang](https://clang.llvm.org/)
+- [Make](https://www.gnu.org/software/make/) or [Ninja Build](https://ninja-build.org/) or any other CMake compatible generator.
+
+Here is how I install them on Fedora:
+
+```shell
+  sudo dnf install clang cmake g++ make ninja-build
+```
+
+Configure CMake, enabled debug for development purposes:
+
+```shell
+  cmake -B build -G Ninja -DCMAKE_BUILD_TYPE=Debug 
+```
+
+Build using configured generator:
+
+```shell
+  cmake --build build --config Debug
+```
 
 ## References