feat(editing-support): add multiple-cursors.nvim (#911)

lua/astrocommunity/editing-support/multiple-cursors-nvim/README.md

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+# multiple-cursors.nvim
+
+A multi-cursor plugin for Neovim that works in normal, insert/replace, or visual modes, and with almost every command
+
+**Repository:** <https://github.com/brenton-leighton/multiple-cursors.nvim>

lua/astrocommunity/editing-support/multiple-cursors-nvim/init.lua

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+return {
+  "brenton-leighton/multiple-cursors.nvim",
+  cmd = {
+    "MultipleCursorsAddDown",
+    "MultipleCursorsAddUp",
+    "MultipleCursorsMouseAddDelete",
+    "MultipleCursorsAddMatches",
+    "MultipleCursorsAddMatchesV",
+    "MultipleCursorsAddJumpNextMatch",
+    "MultipleCursorsJumpNextMatch",
+    "MultipleCursorsLock",
+  },
+  dependencies = {
+    "AstroNvim/astrocore",
+    opts = function(_, opts)
+      local maps = opts.mappings
+      for lhs, map in pairs {
+        ["<C-Down>"] = { "<Cmd>MultipleCursorsAddDown<CR>", desc = "Add cursor down" },
+        ["<C-Up>"] = { "<Cmd>MultipleCursorsAddUp<CR>", desc = "Add cursor up" },
+        ["<C-LeftMouse>"] = { "<Cmd>MultipleCursorsMouseAddDelete<CR>", desc = "Add cursor with mouse" },
+      } do
+        maps.n[lhs] = map
+        maps.i[lhs] = map
+      end
+      local prefix = "<Leader>c"
+      for lhs, map in pairs {
+        [prefix .. "a"] = { "<Cmd>MultipleCursorsAddMatches<CR>", desc = "Add cursor matches" },
+        [prefix .. "A"] = { "<Cmd>MultipleCursorsAddMatchesV<CR>", desc = "Add cursor matches in previous visual area" },
+        [prefix .. "j"] = { "<Cmd>MultipleCursorsAddJumpNextMatch<CR>", desc = "Add cursor and jump to next match" },
+        [prefix .. "J"] = { "<Cmd>MultipleCursorsJumpNextMatch<CR>", desc = "Move cursor to next match" },
+        [prefix .. "l"] = { "<Cmd>MultipleCursorsLock<CR>", desc = "Lock virtual cursors" },
+      } do
+        maps.n[lhs] = map
+        maps.x[lhs] = map
+      end
+    end,
+  },
+  opts = {},
+}