Document all command line parameters in README.md

Author: kgantsov

README.md

@@ -18,7 +18,14 @@ cargo build --release
 
 ```bash
 hammerload <PROTOCOL> --url <URL> [OPTIONS]
+```
 
+Request options
+```
+-X, --method <METHOD>              HTTP method (GET, POST…)
+-H, --header <HEADER>              Custom headers (repeatable)
+-b, --body <STRING>                Request body
+-F, --form <KEY=VALUE>             Form fields (repeatable)
 ```
 
 ## Examples
@@ -28,6 +35,21 @@ Benchmark an HTTP service for 10 seconds with 1 worker
 hammerload http -url http://localhost:8000/files/1
 ```
 
+Passing headers
+```bash
+hammerload http -u http://localhost:8000/files/1 -H "Authorization: Bearer TOKEN" -H "Content-Type: application/json"
+```
+
+Make POST request with json body
+```bash
+hammerload http -X POST -u http://localhost:8000/files/ --duration 1 --concurrency 1 -b '{"filename": "test.txt", "directory_path": "", "file_type": "file", "checksum": "checksum", "size": 0}'
+```
+
+Make POST request with form parameters
+```bash
+hammerload http -X POST -u http://localhost:8000/files/ --duration 1 --concurrency 1 -F "filename=test.txt" -F "file_type=file" -F "checksum=checksum" -F "size=0"
+```
+
 Benchmark an HTTP service for 30 seconds with 200 workers
 
 ```bash