added overseer

lua/overseer/template/user/cmake/configure.lua

@@ -0,0 +1,13 @@
+return {
+  name = 'CMake Configure for nvim',
+  builder = function()
+    local cwd = vim.fn.getcwd()
+    return {
+      cmd = { 'cmake' },
+      args = { '-B', 'build_nvim',
+        '-S', cwd,
+        '-G', 'Ninja' },
+      cwd = build_nvim,
+    }
+  end,
+}