add README

README.md

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+# acms
+
+an automatically schema-versioned content management system
+
+## develop
+
+prepare test data:
+
+```
+cp -r samples/blog .
+cd blog
+git init
+git add .
+git commit -m 'first commit'
+```
+
+run frontend:
+
+```console
+cd frontend
+reload
+```
+
+run backend:
+
+```console
+cd backend
+cabal run backend -- serve
+```
+
+open browser at `http://localhost:8080`.

samples/blog/posts/1-hello-world.json

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+{
+  "title": "hello world!",
+  "contents": "hello world!"
+}

samples/blog/posts/2-second-post.json

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+{
+  "title": "second post",
+  "contents": "lorem ipsum"
+}