85 decrire gestion error dans la platform (#86)

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* update

content/docs/50_platform/architecture/error_management/index.md

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+---
+title: "platform_error"
+description: ""
+weight: 1
+icon: "error"
+---
+
+Here are the rules for the error management inside the platform
+
+The file `src\platform\error.rs` provides the Error class for the platform. This error stores the file and the line of the error.
+
+Platform provides 2 macros to help declaring platform errors.
+
+```rust
+// return a platform error object
+use crate::platform_error;
+// return a platform error object inside an Err result
+use crate::platform_error_result;
+```
+
+Two other result types are defined for common cases
+
+```rust
+// For async task end result
+use crate::platform::TaskResult;
+// For generic task functions that just return OK on success
+use crate::platform::FunctionResult;
+```
+
+Each function of the platform must return at some point an Error platform.
+This allow platform top functions to manage the proper error management and display.