added readmes to all modules

Author: Jesse Eichar

cachingxslt/README.md

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+The cachingxslt module contains an XSLT parser that will cache the compiled XSLT Style sheet to improve the performance of performing
+XSLT transformations.

common/README.md

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+The common module contains very basic utilities that are useful for all projects.  For example utilities for assisting with parsing
+and encoding XML or making HTTP requests.

core/README.md

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+The core module contains the core Geonetwork classes.  For example SearchManager for searching the metadata index, DataManager for saving
+and loading Metadata.
+
+Services, Harvesters, etc... that are are plugins will usually depend on core and will make use of these core classes to implement their
+services.
+
+Geonetwork is wired together via Spring-Dependency-Injection.  The critical classes (DataManager, SchemaManager, SearchManager, etc...) are
+all singleton beans in the application context and can be either injected into other beans or obtained via the ServiceContext.getBean
+method (or ServiceContext.getApplicationContext()).

csw-server/README.md

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+The csw-server module implements the services and support classes for implementing a CSW Server.

harvesters/README.md

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+The harvesters module contains harvester plugins for creating new harvesters which obtain metadata from other sources and add them to
+Geonetwork.

healthmonitor/README.md

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+The heathmonitor module contains various system health checks, like check that verify the index is not corrupted, the database can be accessed
+etc...

jeeves/README.md

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+The jeeves module used to be the Jeeves Web application framework but is in the process of being deprecated and removed.  Right now it
+contains many of the classes and interfaces relevant to the web-application.

oaipmh/README.md

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+The oaipmh module contains classes for providing a oaipmh end point and for writing oaipmh clients.

sde/README.md

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+The sde module provides the stub methods of the ArcSDE library.  This module is required because the ArcSDE libraries cannot be included in
+an opensource project.  They require licencing and therefore the jar created by this module should be replaced on the production server
+with the correct one if ArcSDE harvesting is to be performed.

services/README.md

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+The services module contains the core services.

web-client/README.md

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+The web-client module contains the javascript and html file for the geonetwork web clients.

web/README.md

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+The web module contains the static resources and configuration file for building the final web application WAR.