Controller: Converted README to a gitbook version.

-Split the README into a gitbook documentation.

Change-Id: Iacf94e94d15606d68c925885dac5233d828f29b7
Signed-off-by: CorentinLGS <corentinlgs@gmail.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/docs/Usage.md b/docs/Usage.md
new file mode 100644
index 0000000..65f1ce9
--- /dev/null
+++ b/docs/Usage.md
@@ -0,0 +1,53 @@
+# Usage
+
+## 1) Add app-controller-submodule as a submodule to include in your project
+
+```bash
+git submodule add https://gerrit.automotivelinux.org/gerrit/apps/app-controller-submodule
+```
+
+## 2) Add app-controller-submodule as a static library to your binding
+
+```cmake
+    # Library dependencies (include updates automatically)
+    TARGET_LINK_LIBRARIES(${TARGET_NAME}
+        ctl-utilities
+        ... other dependencies ....
+    )
+```
+
+## 3) Declare your controller config section in your binding
+
+```C
+// CtlSectionT syntax:
+// key: "section name in config file"
+// loadCB: callback to process section
+// handle: a void* pass to callback when processing section
+static CtlSectionT ctlSections[]= {
+    {.key="plugins" , .loadCB= PluginConfig, .handle= &halCallbacks},
+    {.key="onload"  , .loadCB= OnloadConfig},
+    {.key="halmap"  , .loadCB= MapConfigLoad},
+    {.key=NULL}
+};
+
+```
+
+## 4) Do the controller config parsing at binding pre-init
+
+```C
+   // check if config file exist
+    const char *dirList= getenv("CTL_CONFIG_PATH");
+    if (!dirList) dirList=CONTROL_CONFIG_PATH;
+
+    const char *configPath = CtlConfigSearch(apiHandle, dirList, "prefix");
+    if(!confiPath) return -1;
+
+    ctlConfig = CtlConfigLoad(dirList, ctlSections);
+    if (!ctlConfig) return -1;
+```
+
+## 5) Execute the controller config during binding init
+
+```C
+  int err = CtlConfigExec (ctlConfig);
+```
\ No newline at end of file