Add settings.lua

Added an init.lua to lua/core namespace and required 'core' in
main init.lua.

Added settings.lua for general settings of neovim.

nvim/init.lua

@@ -1,2 +1,2 @@
-require( "core.keymaps" )
+require( "core" )
 require( "plugins" )

nvim/lua/core/init.lua

@@ -0,0 +1,2 @@
+require( "core.keymaps" )
+require( "core.settings" )

nvim/lua/core/settings.lua

@@ -0,0 +1,2 @@
+vim.opt.splitright = true
+vim.opt.splitbelow = true