adds darwin-arm64 and updates ,gitignore

.gitignore

@@ -4,4 +4,4 @@ node_modules
 *.tgz
 .npmrc
 types/**/*.d.ts
-
+/**/.DS_Store

README.md

@@ -66,6 +66,7 @@ Downloaded from the sources listed at [ffmpeg.org](https://ffmpeg.org/download.h
 
 * Linux 32-bit: (20181210-g0e8eb07980): https://www.johnvansickle.com/ffmpeg/
 * Linux 64-bit: (20181210-g0e8eb07980): https://www.johnvansickle.com/ffmpeg/
+* Mac OS/X (92718-g092cb17983): https://johnvansickle.com/ffmpeg/
 * Mac OS/X (92718-g092cb17983): https://evermeet.cx/ffmpeg/
 * Windows 32-bit (20181217-f22fcd4): https://ffmpeg.zeranoe.com/builds/win32/static/
 * Windows 64-bit (20181217-f22fcd4): https://ffmpeg.zeranoe.com/builds/win64/static/

package.json

@@ -22,6 +22,7 @@
   "license": "LGPL-2.1",
   "description": "Platform independent binary installer of FFmpeg for node projects",
   "optionalDependencies": {
+    "@ffmpeg-installer/darwin-arm64": "4.1.5",
     "@ffmpeg-installer/darwin-x64": "4.1.0",
     "@ffmpeg-installer/linux-arm": "4.1.3",
     "@ffmpeg-installer/linux-arm64": "4.1.4",

platforms/darwin-arm64/README.md

@@ -0,0 +1,4 @@
+Do not use directly, use ffmpeg-installer:
+
+    npm install --save @ffmpeg-installer/ffmpeg
+

platforms/darwin-arm64/package.json

@@ -0,0 +1,28 @@
+{
+    "name": "@ffmpeg-installer/darwin-arm64",
+    "version": "4.1.5",
+    "description": "Mac OS X FFmpeg binary used by ffmpeg-installer",
+    "homepage": "https://evermeet.cx/ffmpeg/",
+    "scripts": {
+      "test": "file ffmpeg | grep -qF \"Mach-O\"",
+      "prepublishOnly": "npm test",
+      "postinstall": "chmod u+x ffmpeg",
+      "upload": "npm --userconfig=../../.npmrc publish --access public"
+    },
+    "keywords": [
+      "ffmpeg",
+      "binary",
+      "darwin",
+      "arm64"
+    ],
+    "os": [
+      "darwin"
+    ],
+    "cpu": [
+      "arm64"
+    ],
+    "author": "John Van Sickle <john.vansickle@gmail.com>",
+    "license": "GPLv3",
+    "ffmpeg": "92718-g092cb17983"
+  }
+