Add info on how to load osu files #1295

Themes/Rebirth/BGAnimations/ScreenHelpMenu overlay/helpDisplay.lua

@@ -284,6 +284,9 @@ local function helpMenu()
             {
                 Name = "HowToPermamirror",
             },
+            {
+                Name = "HowToPlayOsuCharts",
+            },
         },
         ["Information"] = {
             {

Themes/Rebirth/Languages/en.ini

@@ -399,6 +399,9 @@ HowToFavoriteSongsDescription=Your song library might become huge and Favoriting
 HowToPermamirror=Permanently Mirror Charts
 HowToPermamirrorShortDescription=Hand bias bad
 HowToPermamirrorDescription=Some charts out there are very biased toward one hand, and some players have particularly bad hands. Because Etterna calculates based on physical difficulty and mirroring a chart is still equivalent because only the hands are swapped, mirroring is a core feature of the game and is ranked.\n\nSome charts might need to always be mirrored for some players, but the players might not want to leave mirror on for everything. Permamirror is the solution.\n\nTo permanently toggle mirror on a specific chart, hover it and press Ctrl + M. Every time you open it, mirror will be on.
+HowToPlayOsuCharts=Play Osu charts in Etterna
+HowToPlayOsuChartsShortDescription=Who is daniel
+HowToPlayOsuChartsDescription=Etterna has built-in support for playing .osu files. Files downloaded from the Osu website typically come in the .osz format, which need to be unzipped before they can be read by Etterna.\n\nChange the file extension to .zip and extract the contents using your favorite utility. You will be given a folder with an audio file, banner, and one or more .osu files.\n\nThis folder represents all the pieces of a playable chart, and only needs to be added to your Songs directory.\n\nIf you are unfamiliar with installing songs manually, check the "Manual Song Install" help entry.
 AboutKeymodes=About keymodes
 AboutKeymodesShortDescription=Styles, StyleTypes, StepsTypes, Games ...
 AboutKeymodesDescription=At its root, this game is a simulator for several other real games. This is why keymodes are separated by Game, and then further by Style.\n\nDance - The core game. 4k. Dance-double can be found here, and is 8k. Also contains a 3k type.\nSolo - Separated from the core game, 6k.\nBeat - The BMS game. 5k+1, 7k+1, and doubles for both.\nKb7 - A gamemode that didn't take off, 7k.\nPump - 5k, 6k, and 10k in single, halfdouble, and doubles.\nPopn - Yes, popn. 5k and 9k.\n\nWithin a game, each style is visible in the difficulty displays. You can switch game in SelectMusic settings or the Select Game screen in Options.