Provide tools for creating an amalgamation header

doc/installation.dox

@@ -44,7 +44,7 @@ versions might work.
 \section installation-dependencies Dependencies
 
 Continuable is a header-only library with one required header-only dependency:
-  
+
   - [Naios/function2](https://github.com/Naios/function2) is used as type
     erasure wrapper to convert a \ref continuable_base into a \ref continuable.
 
@@ -120,6 +120,13 @@ and might be installed from there.
            to make it available from various package managers in order to
            make the installation easier.
 
+\subsection installation-installation-amalgamation By using the amalgamation header
+
+For major versions there is an amalgamation header provided which can be
+included without any dependency:
+
+- [3.0.0](https://gist.githubusercontent.com/Naios/b128ab5028a7eb33e4285c0293573d9f/raw/79fe332964a786b21a8661ef65d07a5669260a3c/continuable.hpp)
+
 \subsection installation-installation-copy By copying the headers
 
 If you don't want to rely on CMake or package managers it is possible to

tools/amalgamate/.gitignore

@@ -0,0 +1 @@
+continuable.hpp

tools/amalgamate/amalgamate.hpp.prologue

@@ -0,0 +1,2 @@
+/// This is an automatic generated amalgamation of:
+/// continuable version 3.0.0 (d30814c2ff001)

tools/amalgamate/amalgamate.json

@@ -0,0 +1,11 @@
+{
+   "project":"continuable",
+   "target":"continuable.hpp",
+   "sources":[
+      "include/continuable/continuable.hpp"
+   ],
+   "include_paths":[
+      "include",
+      "dep/function2/function2/include"
+   ]
+}

tools/amalgamate/amalgamate.sh

@@ -0,0 +1 @@
+../../../amalgamate/amalgamate.py --config=amalgamate.json  --prologue=amalgamate.hpp.prologue --source=../..