Add Bliss OS v15.x build instructions

development/build-bliss-os-15.x.md

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+<img src="https://i.ibb.co/0VWm25C/Colors-2-OS.png">
+<p align="center">
+<a href="https://https://blissos.org">Website</a> |
+<a href="https://sourceforge.net/projects/blissos-x86">Download</a> |
+<a href="https://www.paypal.com/donate/?hosted_button_id=J5SLZ7MQNCT24">Donate</a> |
+<a href="https://docs.blissos.org/">Documentation</a> |
+<a href="https://t.me/blissx86">Telegram</a>
+
+## BlissOS
+
+Download the BlissOS source code, based on [AOSP](https://android.googlesource.com) & [Android-x86](http://android-x86.org/)
+
+<div align="center">
+<strong><i>Modified for PC build using Android-Generic Project</i></strong>
+<br>
+<img src="https://i.ibb.co/rf2rv3M/Yep1l4L.png">
+<br>
+</div>
+
+---------------------------------------------------
+
+Please read the [AOSP building instructions](http://source.android.com/source/index.html) before proceeding.
+
+-----------------------
+## What you need to build [BlissOS](https://github.com/BlissRoms-x86/manifest)
+
+
+    Latest Ubuntu LTS Releases https://www.ubuntu.com/download/server
+    Decent CPU (16 Cores or better for a faster performance)
+    16GB RAM (32GB for Virtual Machine)
+    350GB Hard Drive (about 170GB for the Repo and then building space needed)
+
+    Time to compile:
+    Laptop: 6-8 hours
+    Desktop/Workstation: 4-6 hours
+    Server: 1-2 hours
+
+-----------------------
+
+## Grabbing Dependencies
+
+    sudo apt-get install git-core gnupg flex bison gperf build-essential zip curl zlib1g-dev gcc-multilib g++-multilib libc6-dev-i386 lib32ncurses5-dev x11proto-core-dev libx11-dev lib32z-dev ccache libgl1-mesa-dev libxml2-utils xsltproc unzip squashfs-tools python3-mako libssl-dev ninja-build lunzip syslinux syslinux-utils gettext genisoimage gettext bc xorriso xmlstarlet meson glslang-tools git-lfs libncurses5 libncurses5:i386 libelf-dev aapt zstd rdfind nasm rustc bindgen
+
+## Initializing Repository
+
+**Repo initialization**
+
+    repo init -u https://github.com/BlissRoms-x86/manifest.git -b arcadia-x86 --git-lfs
+
+**Sync repo**
+
+    repo sync -c --force-sync --no-tags --no-clone-bundle -j$(nproc --all) --optimized-fetch --prune
+
+## Options
+
+	BLISS_BUILD_VARIANT - (vanilla, gapps, foss) - We currently use this to specify what type of extra apps and services to include in the build. 
+***Note: Default BLISS_BUILD_VARIANT is VANILLA.***
+
+   BLISS_SPECIAL_VARIANT - This can be custom set if you wanna build a version for a specific device 
+    for example `-jupiter` for Steam Deck or `-surface` for Microsoft Surface series
+
+## Setup FOSS apps (if you choose to build FOSS)
+----------------------------
+
+- If you want to build with FOSS (this will include microG Services & some extra apps), go to vendor/foss and then type
+```
+    ./update.sh
+```
+And then choose 1 (x86/x86_64) to fetch all the apps. If you want to include Bromite Webview in, type this instead
+```
+    ./update.sh "" bromite
+```
+## Building
+
+    $ . build/envsetup.sh
+    $ lunch bliss_x86_64-userdebug
+    $ make iso_img
+     
+***Adding build options***
+
+Before running `lunch`, you can add variables into the build to integrate more stuff into the image.
+Note that you can put different variables into the build.
+
+- **To build with FOSS**
+```
+    export BLISS_BUILD_VARIANT=foss
+```
+
+- **To build with [MindTheGapps](https://gitlab.com/MindTheGapps/vendor_gapps)**
+```
+    export BLISS_BUILD_VARIANT=gapps
+```
+- **To add a custom label into a device-specific build**
+```
+    export BLISS_SPECIAL_VARIANT=-Jupiter
+```
+
+- **To build the special "surface" variant which include kernel with patches from linux-surface and the iptsd userspace touchscreen daemon**
+```
+    export BOARD_IS_SURFACE_BUILD=true
+```
+
+- **To build the special "go" variant for BlissOS Go**
+```
+    export BOARD_IS_GO_BUILD=true
+```
+
+
+**More build options will be in Extras part including proprietary native-bridge/widevine libraries**
+
+## Extras
+-------
+
+We do offer some extra libraries that can be compiled into the build. These include :
+
+***Prebuilt Widevine from Windows Subsystem for Android***
+
+https://github.com/supremegamers/vendor_google_proprietary_widevine-prebuilt
+
+Clone to `vendor/google/proprietary/widevine-prebuilt`, The variable to activate this is `USE_WIDEVINE=true`
+
+***Windows Subsystem for Android's libhoudini*** 
+
+https://github.com/supremegamers/vendor_intel_proprietary_houdini
+
+Clone to `vendor/intel/proprietary/houdini`, The variable to activate this is `ANDROID_USE_INTEL_HOUDINI=true`
+## Report build issues
+- You can reach us via [Telegram (Android™-Generic (x86 PC) Community Development)](https://t.me/androidgenericpc)
+