Add readme and build instructions.

ctrtool/BUILDING.md

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+# Building
+## Linux (incl. Windows Subsystem for Linux) & MacOS - Makefile
+### Requirements
+* `make`
+* Terminal access
+* Typical GNU compatible development tools (e.g. `clang`, `g++`, `c++`, `ar` etc) with __C++11__ support
+
+### Using Makefile
+* `make` (default) - Compile program
+	* Compiling the program requires local dependencies to be compiled via `make deps` beforehand
+* `make clean` - Remove executable and object files
+* `make deps` - Compile locally included dependency libraries
+* `make clean_deps` - Remove compiled library binaries and object files
+
+## Native Windows - Visual Studio
+### Requirements
+* [Visual Studio Community](https://visualstudio.microsoft.com/vs/community/) 2015 / 2017 / 2019
+
+### Compiling CTRTool
+* Open `build/visualstudio/CTRTool.sln` in Visual Studio
+* Select Target (e.g `Debug`|`Release` & `x86`|`x64`)
+* Navigate to `Build`->`Build Solution`

ctrtool/README.md

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+# CTR Tool (CTRTool)
+General purpose reading/extraction tool for Nintendo 3DS file formats.
+
+## Supported File Formats
+* ExeFs (.exefs)
+* RomFs (.romfs) (and RomFS wrapped in IVFC)
+* NCCH Format Variants:
+  * CTR Executable Image (.cxi)
+  * CTR File Archive (.cfa)
+  * CIP (.cip) (These are the processes bundled with the kernel image)
+* NCCH ExtendedHeader (.exhdr)
+* CTR Importable Archive (.cia)
+* NCSD Format Variants:
+  * CTR Card Image (.cci/.3ds/.3dz)
+  * CTR System Update (.csu)
+* ES TitleMetaData (.tmd)
+* ES eTicket (.tik)
+* Firmware Images (.firm)
+* CRR (.crr)
+
+
+# Usage
+```
+Usage: ctrtool [options... ] <file>
+Options:
+  -i, --info         Show file info.
+                          This is the default action.
+  -p, --plain        Extract data without decrypting.
+  -r, --raw          Keep raw data, don't unpack.
+  -v, --verbose      Give verbose output.
+  -y, --verify       Verify hashes and signatures.
+  -d, --dev          Decrypt with development keys instead of retail.
+  --titlekey=key     Set tik title key.
+  --seeddb=file      Set seeddb for ncch seed crypto.
+  --seed=key         Set specific seed for ncch seed crypto.
+  --showsyscalls     Show system call names instead of numbers.
+  -t, --intype=type  Specify input file type. [cia, tik, tmd, ncsd, ncch, exheader, exefs, romfs, firm, lzss]
+                     (only needed when file type isn't detected automatically)
+CCI options:
+  -n, --ncch=index   Specify NCCH partition index.
+  --contents=dir     Specify Contents directory path.
+CIA options:
+  -n, --ncch=index   Specify NCCH partition index.
+  --contents=dir     Specify Contents directory path.
+  --certs=file       Specify Certificate chain file path.
+  --tik=file         Specify Ticket file path.
+  --tmd=file         Specify TMD file path.
+  --footer=file      Specify Footer file path.
+NCCH options:
+  --exheader=file    Specify Extended Header file path.
+  --logo=file        Specify Logo file path.
+  --plainrgn=file    Specify Plain region file path
+  --exefs=file       Specify ExeFS file path.
+  --romfs=file       Specify RomFS file path.
+EXEFS options:
+  --exefsdir=dir     Specify ExeFS directory path.
+  --listexefs        List files in ExeFS.
+  --decompresscode   Decompress .code section
+                     (only needed when using raw ExeFS file)
+ROMFS options:
+  --romfsdir=dir     Specify RomFS directory path.
+  --listromfs        List files in RomFS.
+FIRM options:
+  --firmdir=dir      Specify Firm directory path.
+  --firmtype=type    Specify Firm location type, this determines encryption/signing.
+                       - nand: (default) FIRM images installed to internal NAND,
+                       - ngc: FIRM images loaded from NTR game card at boot,
+                       - nor: FIRM images loaded from WiFi board NOR at boot,
+                       - sdmc: FIRM images installed from SD card by FIRM installers (internal dev tool).
+LZSS options:
+  --lzssout=file     Specify lzss output file
+```
+
+# Building
+See [BUILDING.md](/BUILDING.md).