Add more instructions to README.md, create a build script, disable the error 'macro "__TIME__" might prevent reproducible builds'.

[StaticallyTypedRice]

Here are the changes I've made, originally for building on my machine, but I thought I'd submit a pull request in case you also find them useful.

The changes are:

• Adding more instructions (including information about removing the DKMS module) in the README.
• Create a build script with the commands listed in the README for more automatic building and installation.
• Add a setting in the Makefile to disable the error macro "__TIME__" might prevent reproducible builds.