Created TravisCI (markdown)

TravisCI.md

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+contributor hugovk says:
+
+>It took me a while to find a way to install on Travis CI, but thanks to this I got it working:
+
+```
+language: bash
+
+# Use container-based infrastructure for quicker build start-up
+sudo: false
+
+addons:
+  apt:
+    sources:
+    - debian-sid    # Grab shellcheck from the Debian repo (o_O)
+    packages:
+    - shellcheck
+
+script:
+ - shellcheck *.sh
+
+matrix:
+  fast_finish: true
+```