Added Create a Custom Recipe

Signed-off-by: Thomas Walzer <thomas.walzer@reutlingen-university.de>
Change-Id: Ice9a0c4bf385e4a2af5c0e88a1c0d18a1c6ceb74
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/documentation/+/25899
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>

diff --git a/docs/3_Developer_Guides/4_Creating_a_custom_recipe.md b/docs/3_Developer_Guides/4_Creating_a_custom_recipe.md
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+---
+title: Creating a Custom Recipe
+---
+
+
+For adding a custom linux software/service like cannelloni you have to do the following steps:
+
+1. Add repo via devtool (gitrepo stands for the url)
+
+       ```
+       devtool add gitrepo
+       ```
+2. Try to bitbake, if it is working go to step 3
+       
+       ```
+       bitbake packagename (gitrepo name)
+       ```
+    If it is not working you can do (repeating) following steps until it is working
+
+       1. change/modify the recipe in /workspace/recipe/packagename
+       2. change/modify  the sources in /workspace/sources/packagename 
+    3. bitbake packagename
+
+       Now update the recipe, if you do this the first time you have to adapt the license and the LIC-File-Checksum
+
+       ```
+       devtool update-recipce packagename
+       ```
+
+3. Build the recipe and image with devtool
+  
+    ```
+       devtool build packagename
+       devtool build-image agl-demo-platform
+    ```
+
+       If that is working you could add it to git/gerrit. You have to add your recipe to a layer.
+
+       1. Copy files to the recipe
+       2. add recipe to a packagegroup
+       
+4. Git 
+
+       ```
+       git review 
+       git review -s
+       git remote -v update
+       ```
+![Build recipe](images/AGL_add_recipe.png)
\ No newline at end of file

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