Add CMake build system and update README.md

[jopadan]

No description provided.

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Is there a reason you keep making new pull requests?

[dotted]

PRs usually get squashed before merge, so don't worry about the commit log. I'll try and build when I get home from work in about 4 hours.

[dotted]

Doesn't compile, seems you forgot to add the examples to the commit after moving their directories, causing them to be deleted instead.

➜  ADiKtEd git:(pr-47) ✗ git clean -dfX && cmake .
Removing CMakeCache.txt
Removing CMakeFiles/
Removing build/
Removing libadikted/CMakeFiles/
Removing libadikted/libadikted.pc
Removing mapslang/CMakeFiles/
-- The C compiler identification is GNU 9.4.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.29.1")
-- Checking for one of the modules 'slang'
-- Checking for one of the modules 'libadikted'
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE
-- Found SDL: /usr/lib/x86_64-linux-gnu/libSDLmain.a;/usr/lib/x86_64-linux-gnu/libSDL.so;-lpthread (found version "1.2.15")
-- Configuring done
CMake Error at CMakeLists.txt:36 (add_executable):
  No SOURCES given to target: putemple
Call Stack (most recent call first):
  CMakeLists.txt:67 (add_example)


CMake Error at CMakeLists.txt:36 (add_executable):
  No SOURCES given to target: viewmap
Call Stack (most recent call first):
  CMakeLists.txt:67 (add_example)


CMake Error at CMakeLists.txt:36 (add_executable):
  No SOURCES given to target: puttrain
Call Stack (most recent call first):
  CMakeLists.txt:67 (add_example)


CMake Error at CMakeLists.txt:36 (add_executable):
  No SOURCES given to target: putgems
Call Stack (most recent call first):
  CMakeLists.txt:67 (add_example)


CMake Generate step failed.  Build files cannot be regenerated correctly.

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➜  ADiKtEd git:(pr-47) ✗ git clean -dfX && cmake . && cmake --build .
[...]
[ 63%] Linking C executable puttrain
/usr/bin/ld: libadikted/libadikted.so: undefined reference to `ceil'
/usr/bin/ld: libadikted/libadikted.so: undefined reference to `acos'
/usr/bin/ld: libadikted/libadikted.so: undefined reference to `sin'
/usr/bin/ld: libadikted/libadikted.so: undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/puttrain.dir/build.make:87: puttrain] Error 1
make[1]: *** [CMakeFiles/Makefile2:177: CMakeFiles/puttrain.dir/all] Error 2
make: *** [Makefile:130: all] Error 2

[jopadan]

I rebased and squashed the commits fixing the mentioned bugs

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Continued in #48