Add documentation for Helix editor

Author: EskelinenAntti

scripts/helix.md

@@ -0,0 +1,28 @@
+# helix setup
+
+## stdio way
+
+1. Ensure `kotlin-lsp.sh` is executable
+   
+    ```sh
+    chmod +x $KOTLIN_LSP_DIR/kotlin-lsp.sh
+    ```
+
+2. Create a symlink inside your `PATH` to `kotlin-lsp.sh` script, e.g.:
+
+    ```sh
+    ln -s $KOTLIN_LSP_DIR/kotlin-lsp.sh $HOME/.local/bin/kotlin-lsp
+    ```
+
+3. Configure [languages.toml](https://docs.helix-editor.com/languages.html) e.g:
+
+    ```toml
+    [language-server.kotlin]
+    command = "kotlin-lsp"
+    args = ["--stdio"]
+    
+    [[language]]
+    name = "kotlin"
+    language-servers = [ "kotlin" ]
+    ```
+