Add goreleaser config

.gitignore

@@ -1 +1,2 @@
-.DS_Store
+.DS_Store
+dist/

.goreleaser.yml

@@ -0,0 +1,45 @@
+# This is an example goreleaser.yaml file with some sane defaults.
+# Make sure to check the documentation at http://goreleaser.com
+builds:
+  - binary: massdl
+    env:
+    - CGO_ENABLED=0
+    goos:
+      - darwin
+      - windows
+      - linux
+      - freebsd
+    goarch:
+      - amd64
+      - arm64
+      - arm
+      - 386
+      - ppc64le
+      - s390x
+    goarm:
+      - 6
+      - 7
+    main: ./cmd/massdl/
+archives:
+- replacements:
+    darwin: Darwin
+    linux: Linux
+    windows: Windows
+    freebsd: FreeBSD
+    386: i386
+    amd64: x86_64
+  format_overrides:
+    - goos: windows
+      format: zip
+    - goos: darwin
+      format: zip
+checksum:
+  name_template: 'checksums.txt'
+snapshot:
+  name_template: "{{ .Tag }}-next"
+changelog:
+  sort: asc
+  filters:
+    exclude:
+    - '^docs:'
+    - '^test:'