first readme

README.md

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+# ZSC API daemon
+Zero Storage Captcha selfhosted REST API service
+
+## Compile
+Qt5 and OpenSSL are required
+```
+sudo apt install git qt5-default libssl-dev
+git clone --recursive https://github.com/ZeroStorageCaptcha/api-daemon.git zero-captcha-daemon
+cd zero-captcha-daemon
+qmake && make
+```
+
+## Run
+```
+-a --address  Address to bind
+-p --port     Port to bind (7697 by default)
+-t --threads  Working threads (hardware value by default)
+```
+
+## API
+GET request, JSON response
+
+**Each response contains a boolean "status" that indicates the logic success of the operation. If !status, read "message" field.**
+
+1. Generate captcha
+   ```
+   -> /generate?length= [>0] &difficulty= [0-5] &output= [base64|file] IF output=file: &filepath= [file system path]
+   <- "token", IF output=base64: "png" (base64 encoded picture)
+   ```
+2. Validate captcha
+   ```
+   -> /validate?answer= [user's answer] &token = [user's token]
+   <- boolean "valid"
+   ```
+3. Settings
+
+    3.1 Tokens case sensitive to captcha answer:
+    ```
+     -> /settings?case_sensitive= [enable|disable]
+    ```
+    3.2 Only numbers mode:
+    ```
+    -> /settings?number_mode= [enable|disable]
+    ```
+## Example
+1. Generate
+   ```
+   Client: /generate?length=4&difficulty=3&output=base64 
+   Server: 
+   {
+     "png": "iVBORw0KGgoAAAANSU <...> AAAAAElFTkSuQmCC",
+     "status": true,
+     "token":" i2oefBw6mswaORIphgDcY7GwnS"
+   }
+   ```
+2. Validate
+   ```
+   Client: /validate?answer=iuda1&token=i2oefBw6mswaORIphgDcY7GwnS
+   Server: 
+   {
+     "status": true,
+     "valid": false
+   }
+   ```