Added docs

docs/dev_guide/build_source.md

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-# Build From Source
+# Build Snigdha OS
+
+## Overview
+Building **Snigdha OS** from the source code is very easy. In this documentation, I am going to guide you on how to build **Snigdha OS** from the source. And customizing it.
+
+:::danger Caution
+Before running or customizing any script, first examine. Remember, you are running all the scripts produced by **Snigdha OS** at your own risk!
+:::
+
+## Prerequisites
+To build **Snigdha OS** from the source, we need some packages which are hosted on [SNIGDHA OS CORE](https://github.com/snosmirror/snigdhaos-core) repository and [SNIGDHA OS EXTRA](https://github.com/snosmirror/snigdhaos-extra) repository. [SNIGDHA OS TESTING](https://github.com/snosmirror/snigdhaos-testing) is an optional repository. You also need **Chaotic-AUR** because some packages come from the chaotic-aur. e.g : github-desktop.
+
+:::info NOTE
+- Make sure you have internet connection.
+- If you are on **Snigdha OS**, you need not add any repository! By default all the repositories are added and enabled.
+:::
+
+
+
+## Adding Repository
+First of all we will add **Snigdha OS Core** and **Snigdha OS Extra** repository in our pacman configuration. to edit `pacman.conf`, execute the following on your terminal. [I am using nano, you are free to use anything]
+
+```bash
+sudo nano /etc/pacman.conf
+```
+
+:::tip Archlinux
+If you are using **Arch Linux** then you can copy and paste the following.
+
+```bash
+#
+# /etc/pacman.conf
+#
+# See the pacman.conf(5) manpage for option and repository directives
+
+#
+# GENERAL OPTIONS
+#
+[options]
+# The following paths are commented out with their default values listed.
+# If you wish to use different paths, uncomment and update the paths.
+#RootDir     = /
+#DBPath      = /var/lib/pacman/
+#CacheDir    = /var/cache/pacman/pkg/
+#LogFile     = /var/log/pacman.log
+#GPGDir      = /etc/pacman.d/gnupg/
+#HookDir     = /etc/pacman.d/hooks/
+HoldPkg     = pacman glibc
+#XferCommand = /usr/bin/curl -L -C - -f -o %o %u
+#XferCommand = /usr/bin/wget --passive-ftp -c -O %o %u
+#CleanMethod = KeepInstalled
+Architecture = auto
+
+# Pacman won't upgrade packages listed in IgnorePkg and members of IgnoreGroup
+#IgnorePkg   =
+#IgnoreGroup =
+
+#NoUpgrade   =
+#NoExtract   =
+
+# Misc options
+#UseSyslog
+#Color
+#NoProgressBar
+CheckSpace
+#VerbosePkgLists
+#ParallelDownloads = 5
+
+# By default, pacman accepts packages signed by keys that its local keyring
+# trusts (see pacman-key and its man page), as well as unsigned packages.
+SigLevel    = Required DatabaseOptional
+LocalFileSigLevel = Optional
+#RemoteFileSigLevel = Required
+
+# NOTE: You must run `pacman-key --init` before first using pacman; the local
+# keyring can then be populated with the keys of all official Arch Linux
+# packagers with `pacman-key --populate archlinux`.
+
+#
+# REPOSITORIES
+#   - can be defined here or included from another file
+#   - pacman will search repositories in the order defined here
+#   - local/custom mirrors can be added here or in separate files
+#   - repositories listed first will take precedence when packages
+#     have identical names, regardless of version number
+#   - URLs will have $repo replaced by the name of the current repo
+#   - URLs will have $arch replaced by the name of the architecture
+#
+# Repository entries are of the format:
+#       [repo-name]
+#       Server = ServerName
+#       Include = IncludePath
+#
+# The header [repo-name] is crucial - it must be present and
+# uncommented to enable the repo.
+#
+
+# The testing repositories are disabled by default. To enable, uncomment the
+# repo name header and Include lines. You can add preferred servers immediately
+# after the header, and they will be used before the default mirrors.
+
+#[core-testing]
+#Include = /etc/pacman.d/mirrorlist
+
+[core]
+Include = /etc/pacman.d/mirrorlist
+
+[snigdhaos-core]
+SigLevel = Never
+Server = https://snosmirror.github.io/$repo/$arch
+
+#[extra-testing]
+#Include = /etc/pacman.d/mirrorlist
+
+[extra]
+Include = /etc/pacman.d/mirrorlist
+
+[snigdhaos-extra]
+Siglevel = Never
+Server = https://snosmirror.github.io/$repo/$arch
+
+# If you want to run 32 bit applications on your x86_64 system,
+# enable the multilib repositories as required here.
+
+#[multilib-testing]
+#Include = /etc/pacman.d/mirrorlist
+
+[multilib]
+Include = /etc/pacman.d/mirrorlist
+
+# An example of a custom package repository.  See the pacman manpage for
+# tips on creating your own repositories.
+#[custom]
+#SigLevel = Optional TrustAll
+#Server = file:///home/custompkgs
+```
+:::
+