[TD-65] add travis, appveyor, and coverity scan to new develop branch. with badge of master branch.

.appveyor.yml

+version: 1.0.{build}
+os: Visual Studio 2015
+environment:
+  matrix:
+    - ARCH: amd64
+
+clone_folder: c:\dev\TDengine
+clone_depth: 1
+
+init:
+  - call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" %ARCH%
+
+before_build:
+  - cd c:\dev\TDengine
+  - md build
+
+build_script:
+  - cd build
+  - cmake -G "NMake Makefiles" ..
+  - nmake install
+
+notifications:
+- provider: Email
+  to:
+  - sangshuduo@gmail.com
+  on_build_success: true
+  on_build_failure: true
+  on_build_status_changed: true

.travis.yml

+#
+# Configuration
+#
+git:
+  depth: 1
+
+language: c
+
+compiler:
+  - clang
+  - gcc
+
+os:
+  - linux
+  - osx
+
+addons:
+  coverity_scan:
+
+    # GitHub project metadata
+    # ** specific to your project **
+    project:
+      name: TDengine
+      version: 2.x
+      description: TDengine
+
+    # Where email notification of build analysis results will be sent
+    notification_email: sdsang@taosdata.com
+
+    # Commands to prepare for build_command
+    # ** likely specific to your build **
+    build_command_prepend: cmake ..
+
+    # The command that will be added as an argument to "cov-build" to compile your project for analysis,
+    # ** likely specific to your build **
+    build_command: cmake --build .
+
+    # Pattern to match selecting branches that will run analysis. We recommend leaving this set to 'coverity_scan'.
+    # Take care in resource usage, and consider the build frequency allowances per
+    #   https://scan.coverity.com/faq#frequency
+    branch_pattern: coverity_scan
+
+before_script:
+  - mkdir build
+  - cd build
+
+script:
+  - cmake .. 
+  - cmake --build .
+
+#
+# Build Matrix
+#
+matrix:
+  - os: linux
+    addons:
+      apt:
+        packages:
+          - build-essential
+          - cmake
+
+  - os: osx
+    addons:
+      homebrew:
+        - cmake
+

README.md

+[![Build Status](https://travis-ci.org/taosdata/TDengine.svg?branch=master)](https://travis-ci.org/taosdata/TDengine)
+[![Build status](https://ci.appveyor.com/api/projects/status/kf3pwh2or5afsgl9/branch/master?svg=true)](https://ci.appveyor.com/project/sangshuduo/tdengine-2n8ge/branch/master)
+
 [![TDengine](TDenginelogo.png)](https://www.taosdata.com)
 
 # What is TDengine？