Merge pull request #1 from aspnet/tlmii/readme-update

Update README.md

Author: tlmii

README.md

@@ -6,3 +6,46 @@ Repo for HttpRepl tool.
 ## Building
 
 To build this repo, run the `build.cmd` or `build.sh` in the root of this repo. This repo uses the .NET [Arcade toolset](https://github.com/dotnet/arcade).
+
+## Usage
+
+From the in-product help:
+```
+HTTP Commands:
+Use these commands to execute requests against your application.
+
+GET            Issues a GET request.
+POST           Issues a POST request.
+PUT            Issues a PUT request.
+DELETE         Issues a DELETE request.
+PATCH          Issues a PATCH request.
+HEAD           Issues a HEAD request.
+OPTIONS        Issues an OPTIONS request.
+
+set header     Sets or clears a header for all requests. e.g. `set header content-type application/json`
+
+
+Navigation Commands:
+The REPL allows you to navigate your URL space and focus on specific APIS that you are working on.
+
+set base       Set the base URI. e.g. `set base http://locahost:5000`
+set swagger    Set the URI, relative to your base if set, of the Swagger document for this API. e.g. `set swagger /swagger/v1/swagger.json`
+ls             Show all endpoints for the current path.
+cd             Append the given directory to the currently selected path, or move up a path when using `cd ..`.
+
+Shell Commands:
+Use these commands to interact with the REPL shell.
+
+clear          Removes all text from the shell.
+echo [on/off]  Turns request echoing on or off, show the request that was mode when using request commands.
+exit           Exit the shell.
+
+REPL Customization Commands:
+Use these commands to customize the REPL behavior..
+
+pref [get/set] Allows viewing or changing preferences, e.g. 'pref set editor.command.default 'C:\Program Files\Microsoft VS Code\Code.exe'`
+run            Runs the script at the given path. A script is a set of commands that can be typed with one command per line.
+ui             Displays the swagger UI page, if available, in the default browser.
+
+Use help <COMMAND> to learn more details about individual commands. e.g. `help get`
+```