Added READMEs to the test-cases

tests/multifor/README.md

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+multifor
+========
+
+minimal pd-lib-builder project that shows how to compile
+a library that contains multiple C-files that are compiled into
+multiple binaries each containing a different Pd-objectclass.
+some of the objectclasses are only compiled on specific platforms.
+
+this is a special case of the one-object-per-binary library structure.

tests/multilib/README.md

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+multilib
+========
+
+minimal pd-lib-builder project that shows how to compile
+a library that contains multiple C-files that are compiled into
+a single binary containing  different Pd-objectclasses.
+
+this is the general case of the single-binary library structure.

tests/multiple/README.md

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+multiple
+========
+
+minimal pd-lib-builder project that shows how to compile
+a library that contains multiple C-files that are compiled into
+multiple binaries each containing a different Pd-objectclass.
+
+this is the general case of the one-object-per-binary library structure.

tests/multishared/README.md

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+multishared
+===========
+
+minimal pd-lib-builder project that shows how to compile
+a library that contains multiple C-files that are compiled into
+multiple binaries each containing a different Pd-objectclass.
+a local shared library is used for common components.
+
+this is an extended case of the one-object-per-binary library structure.

tests/single/README.md

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+single
+======
+
+minimal pd-lib-builder project that shows how to compile
+a library that contains a single C-file that is compiled into
+a single binary containing a single Pd-objectclass.
+
+this is a degenerate case of the one-object-per-binary library structure.