how-install.md documentation file added.

Signed-off-by: Pavel Erokhin (MairwunNx) <MairwunNx@gmail.com>

Author: MairwunNx

documentation/how-install.md

@@ -0,0 +1,23 @@
+# Installation instructions
+
+For start the modification, you need installed Forge, it is desirable that the version matches the supported versions. You can download Forge from the [link](https://files.minecraftforge.net/maven/net/minecraftforge/forge/index_1.14.4.html).
+Move the downloaded mod to the `mods` folder (installation example below).
+
+Also do not forget to install dependencies, only two types of dependencies: mandatory (game will not start without a mod) and recommended (without a mod, game can start, but I recommend using it)
+
+Downloads: [Core](https://github.com/ProjectEssentials/ProjectEssentials-Core)
+
+```none
+.
+├── assets
+├── config
+├── libraries
+├── mods (that's how it should be)
+│   ├── Project Essentials Core-MOD-1.14.4-1.X.X.X.jar (mandatory)
+│   └── Project Essentials Backup-1.14.4-1.X.X.X.jar
+└── ...
+```
+
+Now try to start the game, go to the `mods` tab, if this modification is displayed in the `mods` tab, then the mod has been successfully installed
+
+## If you have any questions or encounter a problem, be sure to open an [issue](https://github.com/ProjectEssentials/ProjectEssentials-Backup/issues/new/choose)