Update README.md

Author: AXON

README.md

@@ -1,3 +1,5 @@
+# Introduction
+
 This is my very first public `rust` project for fun purposes.
 
 Obviously this was written in  `Rust - a systems programming language` by a noob rustacean with a few hours of experience with rust 😝
@@ -7,7 +9,57 @@ My code may seem funny in some parts since I've just tried to apply what I've le
 So, kindly ignore as long I'm a noob LoL
 
 
-# To-do:
-* Add build details in README.md
-* Completing this project (Means testing it ... the hard part of all, didn't test the final change yet)
-* Once after these, release pre-built binaries for ease of use
+
+# Build instructions
+
+* First of all you need rust. Follow the link below and you should know what to do.
+
+> It'll also autoinstall rustc and cargo for you.
+
+> https://www.rust-lang.org/tools/install
+
+* Once you have rustt and everything it brings, we add a new target. Run the following command:
+
+```bash
+rustup target add x86_64-unknown-linux-musl
+```
+
+> Or if you wan to make for 32bit arch then the target should be `i686-unknown-linux-musl`.
+
+* After you have the build targets installed simply run the following command:
+
+```bash
+cargo build --release --target x86_64-unknown-linux-musl  # For 64bit
+
+# or
+
+cargo build --release --target i686-unknown-linux-musl    # For 32bit
+```
+
+> Then you should find the output as `target/x86_64-unknown-linux-musl/release/rusgik`
+> I recommend to `strip` the binary for reducing the size.
+
+
+# Installation
+
+## For Android-9 and below
+
+* Copy your `ramdisk.img` and the `rusgik` binary in an ext4 partition directory and run the following commands:
+
+```bash
+su
+mkdir ramdisk && ( cd ramdisk && zcat ../ramdisk.img | cpio -iud && mv init init.real )
+rsync rusgik ramdisk/init && chmod 777 ramdisk/init && ( cd ramdisk && find . | cpio -o -H newc | gzip > ../ramdisk.img )
+```
+
+> Tl;dr: In short, you need to rename `init` executable to `init.real` and put `rusgik` as `init` inside your `ramdisk.img`.
+
+## For Android-10 and above
+
+* If your system image is `system.sfs` then you need to extract it, an quick way to do that is: `7z x system.sfs && rm system.sfs`
+
+* Once you have `system.img` you need to mount it: `mkdir mdir && sudo mount -o loop system.img mdir`
+
+* Now rename `init` to `init.real` by running the following command: `sudo mv init init.real`
+
+* Lastly put `rusgik` binary as `init` executable at `/` of system.img: `sudo rsync rusgik mdir/init && chmod 777 mdir/init`