Add README

Add an initial README to explain the basics of the API and the new
parameters.

README.md

@@ -0,0 +1,153 @@
+steve
+=====
+
+Steve is a lightweight API proxy for Kubernetes whose aim is to create an
+interface layer suitable for dashboards to efficiently interact with
+Kubernetes.
+
+API Usage
+---------
+
+### Kubernetes proxy
+
+Requests made to `/api`, `/api/*`, `/apis/*`, `/openapi/*` and `/version` will
+be proxied directly to Kubernetes.
+
+### /v1 API
+
+Steve registers all Kubernetes resources as schemas in the /v1 API. Any
+endpoint can support methods GET, POST, PATCH, PUT, or DELETE, depending on
+what the underlying Kubernetes endpoint supports and the user's permissions.
+
+* `/v1/{type}` - all cluster-scoped resources OR all resources in all
+  namespaces of type `{type}` that the user has access to
+* `/v1/{type}/{name}` - cluster-scoped resource of type `{type}` and unique name `{name}`
+* `/v1/{type}/{namespace}` - all resources of type `{type}` under namespace `{namespace}`
+* `/v1/{type}/{namespace}/{name}` - resource of type `{type}` under namespace
+  `{namespace}` with name `{name}` unique within the namespace
+
+### Query parameters
+
+Steve supports query parameters to perform actions or process data on top of
+what Kubernetes supports.
+
+#### `link`
+
+Trigger a link handler, which is registered with the schema. Examples are
+calling the shell for a cluster, or following logs during cluster or catalog
+operations:
+
+```
+GET /v1/management.cattle.io.clusters/local?link=log
+```
+
+#### `action`
+
+Trigger an action handler, which is registered with the schema. Examples are
+generating a kubeconfig for a cluster, or installing an app from a catalog:
+
+```
+POST /v1/catalog.cattle.io.clusterrepos/rancher-partner-charts?action=install
+```
+
+#### `filter`
+
+Only applicable to list requests (`/v1/{type}` and `/v1/{type}/{namespace}`).
+
+Filter results by a designated field. Filter keys use dot notation to denote
+the subfield of an object to filter on. The filter value is matched as a
+substring.
+
+Example, filtering by object name:
+
+```
+/v1/{type}?filter=metadata.name=foo
+```
+
+Filters are ANDed together, so an object must match all filters to be
+included in the list.
+
+```
+/v1/{type}?filter=metadata.name=foo&filter=metadata.namespace=bar
+```
+
+Arrays are searched for matching items. If any item in the array matches, the
+item is included in the list.
+
+```
+/v1/{type}?filter=spec.containers.image=alpine
+```
+
+#### `sort`
+
+Only applicable to list requests (`/v1/{type}` and `/v1/{type}/{namespace}`).
+
+Results can be sorted lexicographically by primary and secondary columns.
+
+Sorting by only a primary column, for example name:
+
+```
+/v1/{type}?sort=metadata.name
+```
+
+Reverse sorting by name:
+
+```
+/v1/{type}?sort=-metadata.name
+```
+
+The secondary sort criteria is comma separated.
+
+Example, sorting by name and creation time in ascending order:
+
+```
+/v1/{type}?sort=metadata.name,metadata.creationTimestamp
+```
+
+Reverse sort by name, normal sort by creation time:
+
+```
+/v1/{type}?sort=-metadata.name,metadata.creationTimestamp
+```
+
+Normal sort by name, reverse sort by creation time:
+
+```
+/v1/{type}?sort=metadata.name,-metadata.creationTimestamp
+```
+
+#### `page`, `pagesize`, and `revision`
+
+Only applicable to list requests (`/v1/{type}` and `/v1/{type}/{namespace}`).
+
+Results can be batched by pages for easier display.
+
+Example initial request returning a page with 10 results:
+
+```
+/v1/{type}?pagesize=10
+```
+
+Pages are one-indexed, so this is equivalent to
+
+```
+/v1/{type}?pagesize=10&page=1
+```
+To retrieve subsequent pages, the page number and the list revision number must
+be included in the request. This ensures the page will be retrieved from the
+cache, rather than making a new request to Kubernetes. If the revision number
+is omitted, a new fetch is performed in order to get the latest revision. The
+revision is included in the list response.
+
+```
+/v1/{type}?pagezie=10&page=2&revision=107440
+```
+
+The total number of pages and individual items are included in the list
+response as `pages` and `count` respectively.
+
+If a page number is out of bounds, an empty list is returned.
+
+`page` and `pagesize` can be used alongside the `limit` and `continue`
+parameters supported by Kubernetes. `limit` and `continue` are typically used
+for server-side chunking and do not guarantee results in any order.