added support for Ada Language Server

ale_linters/ada/adalsp.vim

@@ -0,0 +1,16 @@
+" Author: Bartek Jasicki http://github.com/thindil
+" Description: Support for Ada Language Server
+
+call ale#Set('ada_lsp_executable', 'ada_language_server')
+
+function! ale_linters#ada#adalsp#GetRootDirectory(buffer) abort
+    return fnamemodify(bufname(a:buffer), ':p:h')
+endfunction
+
+call ale#linter#Define('ada', {
+\   'name': 'adalsp',
+\   'lsp': 'stdio',
+\   'executable': {b -> ale#Var(b, 'ada_lsp_executable')},
+\   'command': '%e',
+\   'project_root': function('ale_linters#ada#adalsp#GetRootDirectory'),
+\})