Create README.md

Author: tonyroberts

README.md

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+# Strata-Excel
+
+Strata-Excel provides Excel bindings to OpenGamma's Strata open source analytics and market risk library.
+
+Strata can be found at https://github.com/OpenGamma/Strata.
+
+## Using Strata-Excel
+
+Strata-Excel uses Jinx, the Excel Java Add-in.
+
+Jinx can be obtained from https://exceljava.com.
+
+Once Jinx is installed the Strata-Excel JAR file must be added to the jinx.ini config file, along with the OpenGamma Strata library and dependencies.
+
+```ini
+[JAVA]
+classpath =
+  <path of strata-excel JAR file>
+  <strata and dependencies>/*.jar
+```
+
+## Building Strata-Excel
+
+The source code can be cloned using git from GitHub:
+
+```
+  git clone https://github.com/exceljava/strata-excel.git
+```
+
+The projects use Apache Maven as the build system. Version 3.5.0 or later is required. Simply run this command to compile and install the source code locally:
+
+```
+  mvn install
+```
+
+Note that Strata-Excel is based on Java SE 8. Version 8u40 or later is required to compile the code.
+
+## Extending Strata-Excel
+
+Strata-Excel wraps the Strata types and methods to expose them to Excel.
+
+These wrappers are generated automatically from the Strata source code via the Python script 'tools/generate_jinx_wrappers.py'
+and package 'tools/gencode'.
+
+In order to add new types and methods to the Strata-Excel wrapper code, update the config files in 'tools/gencode/config' and run
+'tools/generate_jinx_wrappers.py. The folder structure of the config directory mirrors the Strata source.
+
+Python 3.6 is required to build the wrappers.