Add Docker setup for testing

run-tests.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+if [[ $1 == "--verbose" || $1 == "-v" ]]; then
+    VERBOSE=1
+fi
+
+check_results() {
+    if [[ $? -eq 0 ]]; then
+        echo -e "\e[32m$1: PASS\e[0m"
+    else
+        echo -e "\e[31m$1: FAIL\e[0m"
+    fi
+
+    if [[ $VERBOSE == 1 ]]; then
+        sed -n '/^Starting Vader:/,$p' < vader_output
+    fi
+}
+
+export VADER_OUTPUT_FILE=vader_output
+
+vim.basic --not-a-term -c Vader! test/*.vader &>/dev/null
+check_results "VIM" $1
+rm vader_output
+
+if [[ $VERBOSE == 1 ]]; then
+    echo ""
+fi
+
+nvim -es -c Vader! test/*.vader
+check_results "NEOVIM" $1
+rm vader_output