add ci (#2)

* add ci

* format code

* update go version

* update go file

* add kindlegen

* update go file

* update go file

* test ci

* multiline run

* edit go file

* fix tar

* mv kindlegen to usr local bin

.github/workflows/format.yml

@@ -0,0 +1,15 @@
+name: Format
+
+on:
+  push:
+    paths:
+      - '**.go'
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Check formatting
+      run: if [[ -n "$(gofmt -l .)" ]]; then exit 1; fi