Created Development (markdown)

Development.md

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+# Development
+
+## Quickstart
+
+You will need a working Go and Node.js environment.
+
+### Initial build
+
+```sh
+git clone https://github.com/inbucket/inbucket.git
+```
+
+Build the web UI:
+
+```sh
+cd inbucket/ui
+npm i
+npm run build
+```
+
+Build the backend:
+
+```sh
+cd ..
+make
+```
+
+Test Inbucket starts and the web UI loads:
+
+```sh
+./inbucket
+```
+
+Point your web browser at http://127.0.0.1:9000/ and select the Status tab.