added the developing guide

Developming.md

@@ -0,0 +1,51 @@
+# Developing in the QuasarApp group
+
+QuasarApp group developing guid. In this page collected all guides for using programming languages. 
+
+## C++
+
+### Creatin a new repository.
+For build c++ projects QuasarApp group use the CMake build system.
+1. All new projects should be created using our [cmake](https://github.com/QuasarApp/CMakeProject) tempalte. 
+2. All files of the projects must be signed copyright.
+    > Copyright example:
+    ``` cpp
+
+    //#
+    //# Copyright (C) 2021-2021 QuasarApp.
+    //# Distributed under the lgplv3 software license, see the accompanying
+    //#
+    ```
+3. All projects must be have a tests, main shared and static library and executable file for using a main library. For more information about structure projects see [this](ProjectStructure.md) guide. 
+
+4. All projects should be support next cmake targets: 
+    * test - for run tests.
+    * deploy - for create a distribution kits.
+    * release - for prepare signed distro pacakges and update repositories
+    * doc - for generate technical documentation.
+    > Do not worry. All This targets alredy sopports in the our [CMake](https://github.com/QuasarApp/CMake) toolchains and [CMakeProject](https://github.com/QuasarApp/CMakeProject) template. 
+5. All functions and classes must be documented using doxygen comments. For more information about syntaxis of the doxygen comments see the [doxygen](https://www.doxygen.nl/manual/docblocks.html) documentation
+    > Example:
+    ``` cpp
+    /**
+    * @brief qHash are Simple hash function of the Random object
+    * @param rand are Input data.
+    * @return crc32 hash code.
+    */
+    uint qHash(Random rand);
+    ```
+6. All develops library classes must be implemented on the library namespace to avoid conflicts with the names of other libraries.
+    > Example 
+    ``` cpp
+    namespace QH {
+
+        /**
+        * ...
+        */
+        class PKG {
+            // ...
+        }
+    }
+    ``` 
+
+# And good luck it will be useful to you 😉 

README.md

@@ -12,3 +12,4 @@ Guidelines of Development in QuasarApp
 ## List of Guidelines:
 1. [Project structure](ProjectStructure.md)
 2. [Contribution in the QuasarApp group.](Contribution.md)
+3. [Developing in the QuasarApp group.](Developming.md)