CI: make Circle CI to linter repo details (#344)

Signed-off-by: Allen Sun <allensun.shl@alibaba-inc.com>

.circleci/config.yml

@@ -1,16 +1,53 @@
 version: 2
 jobs:
-  build:
+  integration-test:
     docker:
       - image: circleci/openjdk:8-jdk
-
     working_directory: ~/sentinel
-
     environment:
       MAVEN_OPTS: -Xmx3200m
-
     steps:
       - checkout
-
       # Run tests
-      - run: mvn integration-test
+      - run: mvn integration-test
+
+  document-lint:
+    docker: 
+      # this image is build from Dockerfile 
+      # https://github.com/pouchcontainer/pouchlinter/blob/master/Dockerfile
+      - image: pouchcontainer/pouchlinter:v0.1.2
+    working_directory: ~/sentinel
+    steps:
+      - checkout
+      - run:
+          name: use markdownlint v0.5.0 to lint markdown file (https://github.com/markdownlint/markdownlint)
+          command: |
+            find  ./ -name  "*.md" | grep -v vendor | grep -v commandline |  grep -v .github |  grep -v swagger |  grep -v api |  xargs mdl -r ~MD010,~MD013,~MD024,~MD029,~MD033,~MD036
+      - run:
+          name: use markdown-link-check(https://github.com/tcort/markdown-link-check) to check links in markdown files
+          command: |
+            set +e
+            for name in $(find . -name \*.md | grep -v vendor | grep -v CHANGELOG); do 
+              if [ -f $name ]; then 
+                markdown-link-check -q $name; 
+                if [ $? -ne 0 ]; then
+                  code=1
+                fi
+              fi 
+            done 
+            bash -c "exit $code";
+      - run:
+          name: use opensource tool client9/misspell to correct commonly misspelled English words 
+          command: |
+            find  ./* -name  "*"  | grep -v vendor | xargs misspell -error
+      - run:
+          name: use ShellCheck (https://github.com/koalaman/shellcheck) to check the validateness of shell scripts in pouch repo
+          command: |
+            find ./ -name "*.sh" | grep -v vendor | xargs shellcheck
+
+workflows:
+  version: 2
+  ci:
+    jobs:
+      - integration-test
+      - document-lint