added javadoc for the important packages

src/main/java/teetime/framework/package-info.java

+/**
+ * Contains the implementation of the TeeTime framework.
+ */
+package teetime.framework;
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src/main/java/teetime/framework/pipe/package-info.java

+/**
+ * Contains all pipes related classes, such as factories and pre-defined pipes.
+ */
+package teetime.framework.pipe;
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src/main/java/teetime/framework/signal/package-info.java

+/**
+ * Contains the signals that are used within the framework.
+ */
+package teetime.framework.signal;
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src/main/java/teetime/stage/package-info.java

+/**
+ * Contains a set of pre-defined stages, which are ready-to-go and can be used for analysis configuration.
+ */
+package teetime.stage;
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src/main/java/teetime/util/package-info.java

+/**
+ * Contains a set of utility classes, which are used by the TeeTime framework.
+ */
+package teetime.util;
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