added README files for build procedures

BUILD_HOWTO_LINUX.md

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+# How to build stand-alone Linux binaries
+
+To build stand-alone Linux binaries, simply run the *build-with-pyinstaller.sh* script from the isolyzer root directory:
+
+    ./build-with-pyinstaller.sh
+
+This will create the binaries under *pyi-build/dist*. The build script requires PyInstaller. If PyInstaller is not installled, it can be installed using:
+
+    (sudo) pip install pyinstaller
+
+(If you don't know if you have PyInstaller just run the build script, which will display a message id it cannot find PyInstaller.)

BUILD_HOWTO_WINDOWS.md

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+# How to build the Windows binaries
+
+
+## Prerequisites
+
+Windows binaries are now built under Linux using [Wine](https://www.winehq.org/). Make sure you have a recent version of Wine installed. Also check if (a recent version of) the *winbind* package is installed. If not, install it using:
+
+    sudo apt-get install winbind
+
+## Building the binaries
+
+In your console window, go to the root of the isolyzer directory. Then run:
+
+    ./buildwin.sh
+
+The script first checks for the presence of (portable) 64 and 32 versions of Python 2.7 under *Wine*, and installs them if they are not found. Note that the installers need some manual input. Most importantly, make sure you enter the following installation paths:
+
+* `C:\Python27_64` for the 64-bit version;
+
+* `C:\Python27_32` for the 32-bit version.
+
+The script also automatically installs PyInstaller if it is not there already.
+
+Once the above dependencies are installed, 64 and 32 bit binaries are built automatically. The (zipped) binaries can be found in the *dist* directory.
+
+## Troubleshooting
+
+If the output of the build script includes this error:
+
+    err:winediag:SECUR32_initNTLMSP ntlm_auth was not found or is outdated. Make sure that ntlm_auth >= 3.0.25 is in your path. Usually, you can find it in the winbind package of your distribution.
+
+Fix this by installing *winbind* (see the top of this page).
+