Add protocol gateway docs

Brief descriptions for http and s3 protocol gateways.

Signed-off-by: Stanislav Bogatyrev <stanislav@nspcc.ru>

README.md

@@ -16,7 +16,8 @@ Tools to set up local NeoFS network and Neo 3 privnet. Devenv, for short.
 $ make up
 ```
 When all services are up, you need to make GAS deposit for test wallet to be
-able to pay for NeoFS operations. Test wallet is located in `wallet/wallet.json`.
+able to pay for NeoFS operations. Test wallet is located in `wallet/wallet.json`
+with the corresponding key in `wallet/wallet.key`
 
 ```
 $ make prepare.ir

docs/http_gate.md

@@ -0,0 +1,57 @@
+# HTTP Protocol gateway
+
+Protocol Gateway to access data in NeoFS using HTTP protocol.
+
+Source code and more information can be found in [project's GitHub repository](https://github.com/nspcc-dev/neofs-http-gate)
+
+## .env settings
+
+### HTTP_GW_VERSION=0.12.0
+
+Image version label to use for containers.
+
+If you want to use locally built image, just set it's label here. Instead of
+pulling from DockerHub, the local image will be used.
+
+### HTTP_GW_IMAGE=nspccdev/neofs-http-gate
+
+Image label prefix to use for containers.
+
+## Usage example
+
+- Create a new container
+```
+$ neofs-cli --rpc-endpoint s01.neofs.devenv:8080 \
+            --key wallets/wallet.key \
+            container create --basic-acl readonly --await \
+            --policy "REP 1 SELECT 1 FROM *"
+container ID: 4LfREK1cetL4PUji5fqj9SgRTSmaC5jExEDK9HKCDjdP
+awaiting...
+container has been persisted on sidechain
+
+```
+- Put an object into the newly created container
+```
+$ neofs-cli --rpc-endpoint s01.neofs.devenv:8080 \
+            --key wallets/wallet.key \
+            object put --file /tmp/backup.jpeg \
+            --cid 4LfREK1cetL4PUji5fqj9SgRTSmaC5jExEDK9HKCDjdP
+[/tmp/backup.jpeg] Object successfully stored
+  ID: 6EPpYqSFMGWrNLvYE9mNnut1CPKuPBKyi1ixHakzqsSB
+  CID: 4LfREK1cetL4PUji5fqj9SgRTSmaC5jExEDK9HKCDjdP
+```
+- Call `curl -sSI -XGET http://http.neofs.devenv/get/<cid>/<oid>`
+```
+$ curl -sSI -XGET http://http.neofs.devenv/get/4LfREK1cetL4PUji5fqj9SgRTSmaC5jExEDK9HKCDjdP/6EPpYqSFMGWrNLvYE9mNnut1CPKuPBKyi1ixHakzqsSB
+HTTP/1.1 200 OK
+Date: Thu, 03 Dec 2020 10:34:26 GMT
+Content-Type: image/jpeg
+Content-Length: 144017
+x-object-id: 6EPpYqSFMGWrNLvYE9mNnut1CPKuPBKyi1ixHakzqsSB
+x-owner-id: NTrezR3C4X8aMLVg7vozt5wguyNfFhwuFx
+x-container-id: 4LfREK1cetL4PUji5fqj9SgRTSmaC5jExEDK9HKCDjdP
+x-FileName: backup.jpeg
+x-Timestamp: 1606983284
+Last-Modified: Thu, 03 Dec 2020 08:14:44 UTC
+Content-Disposition: inline; filename=backup.jpeg
+```

docs/s3_gate.md

@@ -0,0 +1,18 @@
+# S3 Protocol gateway
+
+Protocol Gateway to access data in NeoFS using AWS S3 protocol
+
+Source code and more information can be found in [project's GitHub repository](https://github.com/nspcc-dev/neofs-s3-gate)
+
+## .env settings
+
+### S3_GW_VERSION=0.12.0
+
+Image version label to use for containers.
+
+If you want to use locally built image, just set it's label here. Instead of
+pulling from DockerHub, the local image will be used.
+
+### S3_GW_IMAGE=nspccdev/neofs-s3-gate
+
+Image label prefix to use for containers.