Implemented static analysis script

cr: https://code.amazon.com/reviews/CR-96185263

Author: Jeffrey Zhang

.gitignore

@@ -29,4 +29,5 @@ Tools/src/github.com/
 Tools/src/golang.org/
 agent/managedInstances/sharedCredentials/example.ini
 build
-vendor/src/github.com/aws/amazon-ssm-agent
+vendor/src/github.com/aws/amazon-ssm-agent
+empty/

README.md

@@ -119,6 +119,8 @@ The following targets are available. Each may be run with `make <target>`.
 | `package`                | `package` packages build result into a RPM, DEB and ZIP package |
 | `pre-build`              | `pre-build` goes through Tools/src folder to make sure all the script files are executable |
 | `checkstyle`             | `checkstyle` runs the checkstyle script |
+| `analyze-install`        | `analyze-install` install static analysis dependencies for local use |
+| `analyze`                | `analyze` runs static analysis script to find possible vulnerabilities |
 | `quick-integtest`        | `quick-integtest` runs all tests tagged with integration using `go test` |
 | `quick-test`             | `quick-test` runs all the tests including integration and unit tests using `go test` |
 | `coverage`               | `coverage` runs all tests and calculate code coverage |