Merge pull request #9 from PIWEEK/md_install_guide

Add installation doc for Linux Ubuntu/Debian distros

libresprite_installation.md

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+# LibreSprite installation guide
+
+[LibreSprite](https://libresprite.github.io/#!/#page-top) is a free and open source program for creating and animating sprites, originated as a fork of [Aseprite](https://www.aseprite.org/).
+
+This guide will cover how to install it in **Linux** for *Debian/Ubuntu* distributions. 
+Basically, you have two options:
+- **Grab an executable image**: easy installation, but an older version (v1.0-dev, Nov 17, 2021)
+- **Compile the source code**: less easy, but with the latest changes (v1.1-dev, Dec 3, 2023)
+
+You can check the [changelog](https://github.com/LibreSprite/LibreSprite/releases) to find which features are included in each version, and which installation option suits you more.
+
+## Grab an executable image
+
+This option it's as easy as to download your image from [here](https://github.com/LibreSprite/LibreSprite/releases) (v1.0 > Assets) and make it executable. It's a prepared binary you should be able to execute directly.
+
+The version you may probably need it's the [libresprite-Linux-x86_64-Debian_10.AppImage](https://github.com/LibreSprite/LibreSprite/releases/download/v1.0/libresprite-Linux-x86_64-Debian_10.AppImage)
+
+To make it executable, you can make it executable [using the UI](https://askubuntu.com/questions/484718/how-to-make-a-file-executable), or by executing `chmod +x ./libresprite-Linux-x86_64-Debian_10.AppImage` from the same directory where you downloaded the image.
+
+Then just run it by doble click, or executing `./libresprite-Linux-x86_64-Debian_10.AppImage` in the terminal.
+
+That's it!
+
+## Compile the source code
+
+This option includes the latests features and it'll should cost you not more than five minutes. I'll try to sum up the most important steps (taken from its [guide](https://github.com/LibreSprite/LibreSprite/blob/master/INSTALL.md)):
+
+1. Open a terminal and install the required dependencies:
+```bash
+sudo apt-get install cmake g++ libcurl4-gnutls-dev libfreetype6-dev libgif-dev libgtest-dev libjpeg-dev libpixman-1-dev libpng-dev libsdl2-dev libsdl2-image-dev libtinyxml2-dev libnode-dev ninja-build zlib1g-dev libarchive-dev
+```
+2. Browse to the directory where you want to compile LibreAsprite. 
+
+> It won't be installed here, it's just temporary.
+
+3. Get the source code:
+```
+git clone --recursive https://github.com/LibreSprite/LibreSprite
+```
+
+> NOTE: Use this exact command to clone the repository
+> 
+> It'll create a new directory called "LibreSprite".
+
+4. Enter the directory and create a new `build` directory inside:
+```bash
+cd LibreSprite
+mkdir build
+cd build
+```
+
+5. Compile the downloaded source code (from the `build`directory):
+
+```bash
+cmake -G Ninja ../usr/local/bin/libresprite
+ninja libresprite
+```
+
+6. Install it:
+
+```bash
+sudo ninja install
+```
+
+7. Execute it:
+
+By default, the binary is placed in `/usr/local/bin` and you can execute it directly from the terminal:
+
+```bashrc
+/usr/local/bin/libresprite & > nohup
+````
+
+Even easier, from the UI, simple press `Alt + F2` with your keyboard, type `libresprite` and press `Enter` to execute it.
+
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