initial commit, added basic build system with conan/meson, dependency on fftw3

.gitignore

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+build/

README.md

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+# Elemmire
+
+## Steps to build
+
+* Install Conan >=2
+```
+conda install -c conda-forge conan
+```
+* Create a conan profile
+```
+conan profile detect --force
+```
+* Install dependencies with conan
+```
+conan install . --output-folder=build --build=missing
+```
+* Build with meson
+```
+cd build
+meson setup --native-file conan_meson_native.ini .. meson-src
+meson compile -C meson-src
+```

conanfile.txt

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+[requires]
+fftw/3.3.9
+
+[generators]
+PkgConfigDeps
+MesonToolchain

meson.build

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+project('Elemmire', 'c',
+  version : '0.1',
+  default_options : ['warning_level=3'])
+
+fftw = dependency('fftw3', version : '3.3.9')
+exe = executable('Elemmire', 'src/main.c', dependencies: fftw)
+
+test('basic', exe)

src/main.c

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+#include <stdio.h>
+#include <fftw3.h>
+
+#define PROJECT_NAME "Elemmire"
+
+int main(int argc, char **argv) {
+    if(argc != 1) {
+        printf("%s takes no arguments.\n", argv[0]);
+        return 1;
+    }
+    printf("This is project %s.\n", PROJECT_NAME);
+    return 0;
+}