[doc] update doc

README.md

@@ -1,2 +1,35 @@
 # TokenIssuer
-Issue Your ERC-20 Token in a Minute
+
+Issue Your ERC-20 Token in a Minute. :rocket:
+
+```
+$ issueToken -h
+
+Usage of ./issueToken:
+  -decimals uint
+        decimals of token (default 6)
+  -name string
+        token Name (default "My Lovely Token")
+  -owner string
+        owner of token, default to message sender
+  -prikey string
+        prikey of message sender
+  -rpc string
+        Ethereum RPC endpoint (default "https://mainnet.infura.io")
+  -symbol string
+        token symbol (default "MLT")
+  -total uint
+        initial supply for token (default 42)
+```
+
+# License
+
+MIT
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.