add build instructions

BUILD_INSTRUCTIONS.md

@@ -0,0 +1,58 @@
+# Build Instructions 
+
+## * Requirements
+
+- [git](https://git-scm.com/)
+- [git-lfs](https://git-lfs.github.com/)
+- [cmake](https://cmake.org/) **>= 3.11**
+- [gcc](https://www.gnu.org/software/gcc/) **>= 4.9** or [clang](https://clang.llvm.org/) **>= 3.8** or [msvc](https://visualstudio.microsoft.com/) **>= 2015**
+
+## * Cloning
+
+```bash
+$ git clone --recursive git://github.com/enduro2d/enduro2d-bootstrap.git
+$ cd enduro2d-bootstrap
+```
+
+> or
+
+```bash
+$ git clone git://github.com/enduro2d/enduro2d-bootstrap.git
+$ cd enduro2d-bootstrap
+$ git submodule update --init --recursive
+```
+
+## * Building
+
+```bash
+$ cd your_bootstrap_repository_directory
+$ mkdir build && cd build
+$ cmake -DCMAKE_BUILD_TYPE=Release ..
+$ cmake --build . -- -j8
+
+# also you can generate Xcode project
+$ cd your_bootstrap_repository_directory
+$ mkdir xcode-build && cd xcode-build
+$ cmake -G Xcode ..
+$ open enduro2d-bootstrap.xcodeproj
+
+# or Visual Studio project
+$ cd your_bootstrap_repository_directory
+$ mkdir msvc-build && cd msvc-build
+$ cmake -G "Visual Studio 15 2017" ..
+$ start enduro2d-bootstrap.sln
+```
+
+## * Running
+
+```bash
+$ cd your_bootstrap_build_directory
+$ ./enduro2d-bootstrap
+```
+
+## * Links
+
+- CMake: https://cmake.org/
+- CMake documentation: https://cmake.org/documentation/
+- CMake FAQ: https://gitlab.kitware.com/cmake/community/wikis/FAQ
+

README.md

@@ -6,16 +6,18 @@
 [![license][badge.license]][license]
 [![paypal][badge.paypal]][paypal]
 
-[badge.travis]: https://img.shields.io/travis/enduro2d/enduro2d-bootstrap/master.svg?logo=travis&style=for-the-badge
+## [Build Instructions](./BUILD_INSTRUCTIONS.md)
-[badge.appveyor]: https://img.shields.io/appveyor/ci/BlackMATov/enduro2d-bootstrap/master.svg?logo=appveyor&style=for-the-badge
+
-[badge.language]: https://img.shields.io/badge/language-C%2B%2B14-red.svg?style=for-the-badge
+## [License (MIT)](./LICENSE.md)
-[badge.license]: https://img.shields.io/badge/license-MIT-blue.svg?style=for-the-badge
+
-[badge.paypal]: https://img.shields.io/badge/donate-PayPal-orange.svg?logo=paypal&colorA=00457C&style=for-the-badge
+[badge.travis]: https://img.shields.io/travis/enduro2d/enduro2d-bootstrap/master.svg?logo=travis
+[badge.appveyor]: https://img.shields.io/appveyor/ci/BlackMATov/enduro2d-bootstrap/master.svg?logo=appveyor
+[badge.language]: https://img.shields.io/badge/language-C%2B%2B14-red.svg
+[badge.license]: https://img.shields.io/badge/license-MIT-blue.svg
+[badge.paypal]: https://img.shields.io/badge/donate-PayPal-orange.svg?logo=paypal&colorA=00457C
 
 [travis]: https://travis-ci.org/enduro2d/enduro2d-bootstrap
 [appveyor]: https://ci.appveyor.com/project/BlackMATov/enduro2d-bootstrap
 [language]: https://en.wikipedia.org/wiki/C%2B%2B14
 [license]: https://en.wikipedia.org/wiki/MIT_License
-[paypal]: https://www.paypal.me/matov
+[paypal]: https://www.paypal.me/matov
-
-## [License (MIT)](./LICENSE.md)