Rewrote README, wrote building guides and cleaned up

- Updated/prettified README.md
- Wrote extensive building guides
- Removed pictures/
- Removed music samples
- Made sure that git creates run/ when cloning

README.md

@@ -1,46 +1,58 @@
 # Progressia
-A free, open source sandbox survival game currently in early development.
+A free, open-source sandbox survival game currently in early development.
+
+## Description
+
+The game has barely begun development so much of its features are yet to be implemented.
+
+In broader terms, Progressia is a challenging game about survival, exploration and
+engineering in a realistic voxel sandbox environment. The game is heavily inspired by
+Minecraft technology mods, Factorio, Vintage Story and Minetest. Progressia's main unique
+features will include highly composite items and blocks, a realistically-scaled world,
+temperature mechanics and a parallelism-capable server.
+
+## System requirements
+
+- GNU/Linux (x64, arm32 or arm64), Windows XP or later (x64 or x86) or MacOS (x64)
+- Java 8 or later
+- OpenGL 2.1 or later
+- Probably at least 4 GiB RAM
+- Less than 1 GiB of storage space
+
+See [Build Guide](docs/building/BuildGuide.md) for compilation requirements.
 
 ## Contributing
 
-For now, contact @Javapony in Telegram for details. Contributing is completely allowed, but we don't have any set guidelines yet.
+All contributors welcome. Please contact Javapony in [Telegram](https://t.me/javapony)
+or join our [Discord server](https://discord.gg/M4ukyPYgGP) for details or help.
 
 ## Building
 
+On GNU/Linux and MacOS:
+
 1. `$ git clone https://github.com/OLEGSHA/Progressia.git`
-2. `$ gradlew build`
+2. `$ chmod +x gradlew`
+3. `$ ./gradlew buildLocal`
 
-### Additional setup for Eclipse IDE
+On Windows:
 
-If you have Buildship plugin installed, use File - Import - Gradle - Existing Gradle Project. Main class is `ru.windcorp.progressia.client.ProgressiaClientMain`.
+1. Download and unpack the repository
+3. Run `gradlew.bat buildLocal` in the same directory that contains `gradle.build` file
 
-Alternatively do the following:
+Alternatively use Linux/MacOS steps in a Bash shell.
 
-1. Add `id 'eclipse'` into `build.gradle` inside `plugins { ... }`:
-```
-plugins {
-    // Apply the java-library plugin to add support for Java Library
-    id 'java-library'
-    id 'eclipse'
-}
-```
-2. `$ gradlew eclipse`
-3. Import the project with File - Import - Existing Projects into Workspace
-4. On Windows, make sure the project has UTF-8 encoding with <RMB on project in project tree> - Properties - Resource - Text file encoding - Other - UTF-8
-
-### Additional setup for IntelliJ IDEA
-
-1. Open the project with File - Open Project
-2. Press button 'Add configuration...' and open 'Application' in templates list
-3. Add `ru.windcorp.progressia.client.ProgressiaClientMain` in 'Main class' text field
-4. Choose `Progressia.main` in 'Use classpath of module' drop-down list
-5. Click 'Create configuration' and press 'Apply'
+For a more in-depth explanation, solutions for common problems and tips for IDE configuration
+please see the [Build Guide](docs/building/BuildGuide.md).
 
 ## Libraries
 
-* LWJGL - OpenGL, OpenAL, GLFW and several more libraries ported to Java
-* Google Guava
-* Trove4j
-* java-graphics/glm - GLM ported to Java. _Maven Central contains an outdated version, a custom repository used instead_
-* OpenSimplex2
-* log4j
+- [LWJGL](https://www.lwjgl.org/) ([GitHub](https://github.com/LWJGL/lwjgl3)) – OpenGL, OpenAL, GLFW and STB libraries ported to Java
+  - [OpenGL](https://en.wikipedia.org/wiki/OpenGL) – a low-level graphics interface
+  - [OpenAL](https://en.wikipedia.org/wiki/OpenAL) – a low-level audio interface
+  - [GLFW](https://www.glfw.org/) ([GitHub](https://github.com/glfw/glfw)) – a minimalistic OpenGL-capable windowing library
+  - [STB (GitHub)](https://github.com/nothings/stb) – a collection of various algorithms. `stb_vorbis` is used
+- [Guava (GitHub)](https://github.com/google/guava) – a generic utilities library
+- [Trove4j (BitBucket)](https://bitbucket.org/trove4j/trove) – optimized primitive collections 
+- [java-graphics/glm (GitHub)](https://github.com/java-graphics/glm) – GLM ported to Java. _Maven Central contains an outdated version, a custom repository used instead_
+- [OpenSimplex2 (GitHub)](https://github.com/KdotJPG/OpenSimplex2) – a minimalistic highly optimized noise generator
+- [Log4j](https://logging.apache.org/log4j/2.x/) [(GitHub)](https://github.com/apache/logging-log4j2) – a logging library