chore: update build manual and script.

.github/linux_build.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+# Create build directory and enter it
+mkdir bin
+cd bin
+# Create internal build and install directory, then enter it
+mkdir build
+mkdir install
+cd build
+
+# Build in Release mode
+cmake -DCMAKE_BUILD_TYPE=Release ../..
+cmake --build .
+cmake --install . --prefix=../install
+
+# Back to root directory
+cd ..
+cd ..