Add initial ESLint support

Author: samwarwick

.eslintignore

@@ -0,0 +1,3 @@
+dist
+node_modules
+token-negotiator*dist

.eslintrc

@@ -0,0 +1,75 @@
+{
+    "root": true,
+    "parser": "@typescript-eslint/parser",
+    "plugins": [
+      "@typescript-eslint"
+    ],
+    "extends": [
+      "eslint:recommended",
+      "plugin:@typescript-eslint/eslint-recommended",
+      "plugin:@typescript-eslint/recommended"
+    ],
+    "rules": {
+        "@typescript-eslint/ban-ts-comment": "off",
+        "@typescript-eslint/ban-types": "off",
+        "@typescript-eslint/indent": "off",
+        "@typescript-eslint/member-delimiter-style": [
+            "off",
+            {
+                "multiline": {
+                    "delimiter": "none",
+                    "requireLast": true
+                },
+                "singleline": {
+                    "delimiter": "semi",
+                    "requireLast": false
+                }
+            }
+        ],
+        "@typescript-eslint/naming-convention": "off",
+        "@typescript-eslint/prefer-namespace-keyword": "error",
+        "@typescript-eslint/semi": [
+            "off",
+            null
+        ],
+        "@typescript-eslint/type-annotation-spacing": "error",
+        "brace-style": [
+            "error",
+            "1tbs"
+        ],
+        "eqeqeq": [
+            "error",
+            "smart"
+        ],
+        "id-denylist": [
+            "error",
+            "any",
+            "Number",
+            "number",
+            "String",
+            "string",
+            "Boolean",
+            "boolean",
+            "Undefined",
+            "undefined"
+        ],
+        "id-match": "error",
+        "indent": "off",
+        "no-eval": "error",
+        "no-redeclare": "error",
+        "no-trailing-spaces": "error",
+        "no-underscore-dangle": "off",
+        "no-var": "error",
+        "prefer-const": "off",
+        "semi": "off",
+        "spaced-comment": [
+            "error",
+            "always",
+            {
+                "markers": [
+                    "/"
+                ]
+            }
+        ]
+    }
+  }