Create roadmap.md

Author: pensivebrian

doc/roadmap.md

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+# Roadmap
+The following milestones outline the areas of focus for future mssql-cli work. This document is not intended as a commitment to any 
+specific feature or timeline. Instead, the intent is to group related work into milestones using broader themes to convey the direction
+and priorities of mssql-cli.  Actual work and focus may change, but the hope is this roadmap is our guide.
+
+## Feedback
+The best way to give feedback is to create a github issue in the [dbcli/mssql-cli](https://github.com/dbcli/mssql-cli/issues) repo 
+using the [roadmap label](https://github.com/dbcli/mssql-cli/labels/roadmap). 
+
+## Milestone 1
+* Parity with pgcli and mycli
+  * Support special commands
+  * Smart completion
+* Engineering Fundamentals
+  * Jenkins
+  * AppVeyor
+  * Code coverage > 80%
+
+## Milestone 2
+* Packaging
+  * self-contained python runtimes
+* Package manager support
+  * brew
+  * apt-get
+  * yum
+
+## Milestone 3
+* Non-interactive support
+  * Pipe queries via stdin
+  * Pipe query results to stdout
+  * sqlcmd syntax
+
+## Future Milestones
+* Innovation
+  * New special commands
+    * Script object
+    * Script table data
+    * Script database
+  * Peek definition
+  * Schema compare
+  * Per database query history