v1.0

.gitignore

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 build/*.o
 combigen
+combigen.exe
+combigen.obj

README.md

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 An efficient CLI tool to generate possible combinations written in C++
 
 ##Introduction
+Combigen aims to assist with data generation and exploration. Given a `.json` input where each key contains an array of string values, combigen can either generate every possible combination or a random subset of the possible combinations. It aims to be memory-efficient while maintaining high-performance. This can especially useful when large amounts of data are needed for statistical analysis or mock data in an application.
 
+It supports exporting to `.csv` and `.json`.
+
+##Usage
+Basic commands are listed below:
+
+```
+Usage: combigen [options]
+   -h             Displays this help message
+   -a             Generates every possible combination (use with caution)
+   -n <index>     Generate combination at nth index
+   -i <input>     Take the given .json file or string as
+                  input for the combinations.
+                  Example: "{ "foo": [ "a", "b", "c" ], "bar": [ "1", "2" ] }"
+   -o <output>    Write out the results to the file name
+   -t <type>      Output type (csv or json). Defaults to csv
+   -r <size>      Generate a random sample of size r from
+                  the possible set of combinations
+   -d <delimiter> Set the delimiter when displaying combinations (default is ',')
+   -k             Display the keys on the first line of output (for .csv)
+   -v             Verbosely display all of the combinations to
+                  stdout when generating a subset and an output
+                  file has been given
+```
+##Installation
+
+###Linux/UNIX
+1. Clone the repository and `cd` into it:
+
+```
+$ git clone https://github.com/iamtheburd/combigen.git && cd combigen
+```
+
+2. Build with `make`:
+
+```
+$ make
+```
+
+3. Install:
+
+```
+$ sudo make install
+```
+
+###Windows
+1. Download Visual Studio and install first
+
+2. Clone the repository to some directory
+
+3. Open up the Developer Command Prompt (can usually be found by searching in the Start menu)
+
+4. `cd` to where your cloned repository is
+
+5. Build the file:
+
+```
+> cl src\combigen.cpp /EHsc
+```
+
+6. Place the resulting `combigen.exe` wherever you desire
+
+Alternatively, you can also check out the [Releases](https://github.com/iamtheburd/combigen/releases) tab and directly download the `combigen.exe` from there.
+
+
+## Contributing
+Pull-requests are always welcome!
 
 ## License
 Licensed under GPLv3, see [LICENSE](https://github.com/iamtheburd/blob/master/LICENSE)