Created Command Line Client (markdown)

Command-Line-Client.md

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+## Installation
+
+Execute: <kbd>go get github.com/jhillyerd/inbucket/cmd/client</kbd>
+
+## Usage
+```
+Usage: client <flags> <subcommand> <subcommand args>
+
+Subcommands:
+        commands         list all command names
+        flags            describe all known top-level flags
+        help             describe subcommands and their syntax
+        list             list contents of mailbox
+        match            output messages matching criteria
+        mbox             output mailbox in mbox format
+
+
+Top-level flags (use "client flags" for a full list):
+  -host=localhost: host/IP of Inbucket server
+  -port=9000: HTTP port of Inbucket server
+```